20 Kilo Ohms To Ohms

Random converter

Convert kiloohm [kΩ] to ohm [Ω]

i kiloohm [kΩ] = 1000 ohm [Ω]

More about Electrical Resistance

This is how the resistive heating element looks like when information technology is heated to 800°C.

Overview

Definition of Electrical Resistance

Ohm'south Police

Units

Some History

The Physics of Resistance in Metals and Uses for It

The Physics of Resistance in Semiconductors and Uses for It

The Physics of Resistance in Gases and Uses for It

The Physics of Resistance in Electrolytes and Uses for It

The Physics of Resistance in Dielectrics and Uses for Information technology

Resistors and Their Use

Color Coding of Resistors

Measuring Resistors

Overview

Resistors on this power supply excursion board are marked in ruby and make upwardly half of its components.

We can say that the term "resistance" is more "lucky" than many other terms in physics, because we are used to this word and its significant from early babyhood. When we are modest, we explore our environment and larn about various types of resistance, not just in the electrical sense. For instance, nosotros face resistance of the other child, whose toy we try to borrow. Electrical resistance usually does non cause cliffhanger or misunderstanding when we study it at school.

It is used so much in today's globe, that we cannot even count all of the resistors — devices that operate based on resistance. Information technology is plenty to mention that in the nearly mutual electronics used today — mobile phones, smartphones, tablets, and computers — the number of resistors tin accomplish several hundred one thousand. Statistically, more than 35% of electronic components on circuit boards are resistors. Given the amount of product of such devices globally, nosotros can gauge that at that place are tens of trillions of them. We could say that forth with the other passive electronic components such as inductors and capacitors, resistors are office of the foundation of our civilization as we know — they are the metaphorical whales that our world rests on.

The resistance of electric cables must exist as small-scale as possible

Definition of Electrical Resistance

Electric resistance is a physical quality of matter to resist the loss-free period of an electrical current through information technology. In electric engineering, resistance is a property of an electrical circuit or its part, which prevents electric current from flowing freely through information technology. Information technology is calculated as a ratio of the potential difference (voltage) between two points of the circuit to the current that runs through the circuit.

Electrical resistance is related to the transport and conversion of electric energy to other types of energy. When the conversion from electrical free energy to thermal free energy is irreversible, we talk well-nigh resistance. On the other hand, when the electric free energy is reversibly converted into energy of a magnetic or an electric field, and if the alternating current runs through the circuit, we consider electrical reactance. If there is a large amount of inductance in the circuit, then we consider inductive reactance, and if there is capacitance, so nosotros talk almost capacitive reactance. When nosotros say "resistance" we could mean a specific example in the example with thermal energy above, or we could talk nigh resistance and resistivity in general.

When nosotros desire to make sure to include both in our discussion of the behavior of circuits with alternating current, nosotros talk near electrical impedance, which combines the specific instance of resistance discussed above and capacitive and inductive reactance. When we discuss electromagnetic fields and electromagnetic waves, so we talk about wave impedance.

Ohm's Law

Resistance can exist denoted by the letter of the alphabet R or r, and is considered a constant for a given usher inside specific limits. It tin be plant equally:

Ohm's Police force

R = U/I

Where

R is resistance measured in ohms (Ω);

U is the potential difference or voltage between the ends of the usher, measured in volts (V);

I is the electrical current that runs between the ends of the conductor, measured in amperes (A).

This formula is known as Ohm's law, named after the German physicist who discovered it. There is another important police force that describes the discharge of heat energy when an current passes through a conductor. This constabulary is known equally Joule's first law:

Q = I² × R × t

where

Q is the amount of heat discharged during a given time t, where the energy is measured in joules (J);

I is the electric electric current (A).

R is resistance (Ω);

t is the elapsing of time during which the current is running through the conductor, measured in seconds (due south).

Georg Simon Ohm

Units

Ohm and values derived from it such as kiloohms (kΩ) and megaohms or megohms (MΩ) are the SI units used to measure resistance. You tin encounter how ohms chronicle to other units by using the unit converter on our website.

Some History

Georg Simon Ohm was an outstanding physicist, among the first to inquiry electrical resistance. In one of his works published in 1827, he stated the famous police force named afterwards him that describes the relationship betwixt the potential difference, electric current, and resistance. This discovery had a tremendous impact on the research of electricity and on the development of methods to utilise it in daily life and in the industry. Unfortunately, in the commencement, his contemporaries did non grasp the importance of his work, and he was, in fact, made to resign from his post of a mathematics teacher in Cologne for publishing the results of his work in the local papers. He was finally recognized for his contributions to physics when he was awarded the Copley Medal on the 30th of November, 1841 past the Royal Social club of London. In 1881 information technology was suggested during the International Exposition of Electricity in Paris that the unit of measurement of electric resistance is named afterwards him.

The Physics of Resistance in Metals and Uses for It

All of the materials are divided according to their relative resistance into conductors, semiconductors, and dielectrics. At that place is likewise a special separate class for materials, the resistance of which is cypher or near to nil. They are chosen superconductors. Some of the near common examples of conductors are metals, although their resistance tin exist within a rather wide range, depending on the properties of their crystal lattice.

Currently, nosotros think that atoms of metals grade a crystal lattice. Valence electrons form the so-called "electron gas" traveling through the lattice.

Filament failure of an incandescent light bulb equally it happens in the air

The relatively low resistance of metals has to do with their limerick — they have as office of their construction a large number of conductivity electrons, which are accuse carriers for the atoms that the cloth is composed of. An external electric field causes the electrons to motility in a systematic way, and this motion causes an electric current to flow through the cloth. The electric field accelerates the electrons, and they then collide with the ions of the crystal lattice. These collisions change the momentum of the electrons. Every bit a result, they lose some of their kinetic energy, because information technology is converted into the energy stored in the crystal lattice. This stored energy causes the conductor to warm up as the electric current runs through it. It is important to note that the resistance of a given metallic or an alloy depends on its geometry and does not depend on the management of the external electric field that is applied to this cloth.

As this external field intensifies, the electrical current that runs through the metal increases, and more and more heat is emitted. This heat may increase so much that information technology will melt the metal. Fuses that accept a wire component apply this property. The wire melts if the rut exceeds the pre-set standards, as determined by the melting point of the material chosen for the wire. The melted wire interrupts the current catamenia in the electrical circuit. We tin can get an thought of what happens to fuses in action if nosotros look at photographs or videos of filament failure in an incandescent calorie-free seedling.

The almost common use for electric resistance is its use every bit a heating unit of measurement. We use this property while cooking and heating food on electrical stoves, baking bread and cakes in electric ovens, and also when working with electric kettles, coffee makers, washing machines, and electric irons. We rarely acknowledge this in our everyday life, but nosotros owe our comfort to electrical resistance, whether we turn on the h2o heater for our shower, an electric fireplace, or an air conditioner with a heater office to heat our room. All of these devices have a heating element that uses electrical resistance.

Electrical resistance is used in the manufacture for drying when creating candy foods, to facilitate ideal temperatures for chemic reactions when making medicine, plastic bags, or for creating products from plastics using the procedure of extrusion.

The Physics of Resistance in Semiconductors and Uses for It

Different the example with metals, the crystalline structure of semiconductors is formed due to covalent bonds between atoms of the semiconductor. Because of this, semiconductors in their pure form without other materials mixed into them have a college electric resistance than do metals. We should note that when talking about semiconductors we ordinarily consider their intrinsic conductivity, not their resistance.

A microprocessor and a video card

When we mix the semiconductor cloth with another material that has atoms with a larger number of electrons on the outer electron beat out, the semiconductor becomes northward-type considering of the extrinsic conductivity. This is known as doping. In fact, semiconductors of this type along with the p-type ones are known as extrinsic semiconductors. In this case, the "extra" electrons become function of the total grouping of atoms in a given semiconductor, and its resistance decreases. Similarly, when nosotros add together other atoms to the semiconductor that have fewer electrons on the outer electron shell, we get a p-type semiconductor. Here the "missing" electrons, known equally "holes", become part of the whole group of atoms in the semiconductor, and the semiconductor's resistance also decreases.

In the nearly interesting example parts of the semiconductor take mixed conductance as a result of having two types of materials joined together. This is known as a p-n junction — it has a unique property known as anisotropy, which is characterized past the semiconductor's dependence on the external electric field. The resistance of the p-n junction depends on the direction of this external electrical field. When the voltage "locks" this type of semiconductor, the intermediate boundary layer connects the two types of conducting fabric and the overall resistance drastically increases. When the voltage "unlocks" the intermediate layer, the recombination of carriers occurs in the intermediate layer, and the resistance of this p-n junction quickly increases.

Rectifier diodes, which are some of the key electronic components, operate on this principle. Unfortunately, when the electric current that runs through the p-n junction exceeds the immune value, a thermal breakdown occurs. This causes both the p-blazon and the n-type elements to move through the p-n junction, and the device fails.

The main matter nosotros should keep in mind near the p-n junction is that its resistance is not linear simply depends on the direction of the external electric field, which is to say that its properties are non in accordance with Ohm's law.

The processes that happen inside MOSFET (metal-oxide-semiconductor field-effect) transistors are different. The electric field controls their source and drain resistance. The polarity created by the gate depends on whether it is the p-type or the northward-type channel. MOSFET transistors are used almost exclusively in the on-off mode — they stand for the majority of electric components in modernistic digital devices.

Regardless of their performance, nosotros tin can say that to a certain caste all transistors are in fact inertialess controlled electrical resistors.

The flash in a xenon flash tube (circled in red) occurs after the gas is ionized when its electrical resistance is reduced

The Physics of Resistance in Gases and Uses for It

Under normal conditions, gases are great dielectrics considering they have a very small number of charge carriers such as positively charged ions and electrons. This belongings of gases is used in contact switches, overhead power lines, and air-gap capacitors because air is a mix of gases and its electric resistance is very big.

Gases take ionic conductance, and because of it when an external electrical field is interim upon the gases, their resistance slowly decreases. This is a result of the increase in the ionization of molecules. As the voltage increases, a glow discharge occurs and the resistance becomes more than closely dependent on the voltage. This property of gases was used in the past in gas lights called stabistors for stabilizing the DC for a wide range of currents. As the external voltage further increases, the discharge in the gas becomes a corona discharge, the resistance drops more, and the discharge turns into an electric spark. Every bit this happens, an equivalent of a small lightning occurs and the resistance of the gas around the lightning drops to a minimum.

The main component of the Terra-P radiometer and dosimeter is a Geiger–Müller tube. Its performance depends on the ionization of the gas within of information technology through collision, when gamma ray photons enter it. The resulting rapid decrease of resistance is registered by the control circuit.

The belongings of ionized gases to glow when a small electrical electric current flows through them is widely used in neon lighting for advertizing, for displaying the electromagnetic field (neon voltage testers), and in sodium-vapor lamps used for lightning. Energy-saving compact fluorescent lamps work on the same principle due to the ability of mercury vapors to glow in the ultraviolet spectrum. The light of the visible spectrum is produced by the conversion of the ultraviolet radiation into visible light in a phosphor blanket, which covers the inside of the lamp. Similar to semiconductors, the resistance of gases is not-linear and depends on the external electrical field. Information technology also does non comply with Ohm's constabulary.

The Physics of Resistance in Electrolytes and Uses for It

Electrolytes are liquids that comport electricity. Their resistance is adamant by the concentration of ions of dissimilar polarities. These ions are atoms or molecules that either lost or gained electrons. In the former case they are chosen cations, and in the latter case — anions. When we place 2 electrodes with opposite charge within an electrolyte and thus create an external electric field, cations and anions start moving. The mechanism of this process is based on the charging and the loss of charge of a given electrode. Anions requite away extra electrons on the anode, and cations gain the missing electrons on the cathode.

A plastic shower head is electroplated with chrome. We can see a sparse red layer of copper on the inner side that is not plated with chrome.

A significant deviation between electrolytes and metals, semiconductors, and gases is the movement of particles of the electrolytes within them. It is widely used in medicine and technology, from refining metals by filtering out impurities to the introduction of medicine into a given area of the trunk through electrophoresis. Nosotros owe our shiny bathtubs and faucets to electroplating — a process of covering surfaces with metals, chrome, and nickel in this case. The quality of electroplating depends on the temperature and resistance of the electrolyte, in which the process runs, equally well as on other parameters.

From the perspective of physics, our body is an electrolyte and we have to remember it when information technology comes to personal safety, in particular with regards to resistance and the electric electric current running through the body. The boilerplate resistance of human pare is most 50 kΩ, equivalent to a weak electrolyte, but it can change depending on the emotional land of the person and on the environment, as well every bit on the area of the contact between the conductor and the skin. Stress, agitation, and uncomfortable weather tin cause resistance to decrease, and because of this, it is common to assume the resistance of i kΩ when considering safety.

We should note that the lie detector works by measuring the resistance on different areas of the peel. It is believed to aid with determining which questions are uncomfortable for the interviewee when used in conjunction with other physiological measurements. Nosotros should proceed in heed that this method is very limited — information technology gives wrong readings when used with psychologically unstable people, with those trained on "cheating" this device, and with people who have an unusually high pare resistance.

Ohm's police force tin can be applied to electrolytes to a degree, just afterwards a certain threshold for the strength of the external electric field is reached, the resistance of the electrolyte becomes not-linear.

The Physics of Resistance in Dielectrics and Uses for It

The resistance of dielectrics is rather high, and this property is widely used in physics and engineering when using these materials equally insulators. The vacuum is the ideal dielectric. What resistance could nosotros perchance talk about in a vacuum? Well, thank you to ane of the less pop works of Albert Einstein (compared to his famous piece of work on relativity), the one that considers the work performed by electrons separating from a metal, using resistance in a vacuum, nosotros can now create a number of electronic devices that accept been serving mankind since the early days of electrical and RF applied science.

Magnetron 2М219J installed in a consumer microwave oven

According to Einstein, whatsoever conducting material is surrounded past a cloud of electrons, which creates a cathode ray when an electrical field is applied to them. Two-electrode vacuum devices have unlike resistance when the polarity of the practical voltage changes. Until the 1960s, they were used for the rectification of alternating current. Vacuum tubes with 3 or more electrodes were used to amplify signals. Now they are replaced by more free energy-efficient transistors.

Nonetheless, vacuum tubes are still used in the manufacture. X-ray tubes and magnetrons that are used in radars are vacuum tubes. In club to empathise the physical processes, engineers still apply the screens of oscilloscopes made with cathode ray tubes, doctors cannot do without x-rays, and all of united states of america use microwave ovens, in which magnetrons produce microwave radiations used to oestrus nutrient.

Because the nature of conductance in a vacuum is electronic, the resistance of nigh vacuum tube devices abides by Ohm's police force.

SMD resistors

Resistors and Their Use

Potentiometer

A resistor is a passive component that is used to provide electric resistance in electrical circuits. In addition to resistance, resistors, as a technical manifestation of the phenomenon of electrical resistance, have small capacitance chosen stray capacitance and pocket-sized inductance called devious inductance. In applied applications, engineers frequently consider the non-linearity of the electric current-voltage characteristic of resistors.

A resistor is a device needed in every electrical circuit. According to the statistics, they make up to 35% of whatsoever circuit. Of course, we could make a circuit without them, but this would simply be a theoretical entity — practical implementations are unimaginable without resistors. An electrical engineer could call any electronic component a resistor, regardless of how it was fabricated and designed, equally long equally information technology provides electric resistance. A great instance of this is the crash of the airship of the researcher Umberto Nobile, named "Italia". The radio operator managed to ship out an SOS indicate after he replaced a broken resistor with a slice of pencil pb. In the stop, this saved the explorers.

x W ceramic resistor

Resistors are important components in electronic devices and can be used as private components or as parts of integrated circuits. Discrete resistors are classified according to their use, the blazon of current-voltage human relationship, prophylactic specifications, mounting method, the way their resistance changes, manufacturing specifications, and the corporeality of thermal emissions. They are marked in circuit diagrams as in the image below.

Resistors tin exist connected either in series or in parallel. When the connectedness is in series, the overall resistance of the circuit is the sum of resistances of each resistor:

R = R_ane + R₂ + … + R_n

When the connexion is in parallel, then the total resistance of the circuit is:

R = R₁ × R_two × … × R_n/(R₁ + R₂ + … + R_n)

Resistors are classified based on their apply into:

• Resistors for general use;
• Specialized resistors.

Equally for the way their resistance changes, resistors are divided into:

• Fixed resistors;



PCB-mount trimmer potentiometer

• Trimmer pots or trimpots
• Slide pots or thumb pots (potentiometers).

Based on the mounting method, resistors are classified as:

• Those for printed circuitry;
• Those used in bespeak-to-indicate structure;
• Resistors for microchips and microelectronic modular assembly.

Nomenclature based on the blazon of current-voltage relationship is as follows:

• Linear fixed resistors: they are more often than not general-purpose components used for voltage division, for limiting electric current, and for power dissipation;
• Varistors: their resistance depends on the external voltage and significantly drops when a sure threshold is reached; they are used to protect equipment from pulse surges and rapid changes in voltage;
• Thermistors: their resistance depends on temperature. There are thermistors with negative equally well as with positive temperature resistance coefficient, known as negative temperature coefficient (NTC) thermistors and positive temperature coefficient thermistors (PTC) or posistors. They are used in fire safety, temperature control systems, and temperature command circuits. Historically they were used in RF and microwave power measurements. When we turn on an onetime television set that uses a cathode ray tube, we create a magnetic field with waning amplitudes, considering the display has a degaussing coil, which is turned on through a posistor. Thanks to this, a remnant magnetic field does not distort the colors on the display.



0.5 Westward axial-lead resistors on record

• Photoresistors: their resistance is influenced past the lighting conditions. They are used as photosensors in tracing and tracking devices every bit well every bit in consumer photoelectric relays, in security systems, and in systems that automatically open doors and turnstiles, for case in the subway.
• Magnetoresistors: their resistance depends on the intensity of the magnetic field and they are used to measure out magnetic consecration and power and employed every bit sensors in touch-free switches, linear move sensors, Hall effect sensors, and remote potentiometers.

Color Coding of Resistors

Resistors are color-coded according to their size and use. Color coding can be done in conjunction with alpha-numeric coding, and resistors tin can exist marked with dissimilar color stripes if they are meant equally detached components. A given symbol can marker decimal points. Ohms are marked as R and E, kiloohms — equally K, and megohms — as Thousand. For instance, 3R3 means 3.3 Ω, 33E = 33 Ω, 4К7 = 4.7 kΩ, М56 = 560 kΩ, 1М0 = 1.0 MΩ.

Resistor color coding

Measuring the resistance of a resistor using a multimeter

Small resistors used as detached components are marked with color stripes in accordance with established coding tables. We could discover information on coding in books but it is much easier to find it online.

Surface-mount device (SMD) resistors are coded with three or four digits or iii symbols. The codes can be adamant by checking a table or looking upwards this information online.

Measuring Resistors

The nigh applied mode of determining the specifications of a given resistor and checking if information technology is working correctly is to measure its resistance directly by using a multimeter. If you examination resistors installed in a device, you lot must call up that you can merely examination resistors if your device is non powered. Note that the results of measurements of installed resisters volition be incorrect.

References

Practice you have difficulty translating a measurement unit into another linguistic communication? Help is available! Postal service your question in TCTerms and you volition get an answer from experienced technical translators in minutes.

Electrical Engineering science

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics, and electromagnetism. Information technology covers subtopics similar ability, electronics, command systems, signal processing and telecommunications.

Electrical Resistance Converter

The electrical resistance of a circuit component is the opposition to the passage of an electric current through that component.

The SI unit of measurement of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S). The ohm is defined every bit a resistance betwixt two points of a usher when a constant potential difference of 1 volt applied to these points produces a current of 1 ampere.

Using the Electrical Resistance Converter Converter

This online unit converter allows quick and authentic conversion between many units of measure out, from one system to another. The Unit Conversion folio provides a solution for engineers, translators, and for anyone whose activities require working with quantities measured in dissimilar units.

You can use this online converter to convert betwixt several hundred units (including metric, British and American) in 76 categories, or several thousand pairs including acceleration, surface area, electrical, energy, force, length, light, mass, mass flow, density, specific volume, ability, pressure, stress, temperature, time, torque, velocity, viscosity, volume and capacity, volume flow, and more.
Notation: Integers (numbers without a decimal catamenia or exponent annotation) are considered accurate upward to 15 digits and the maximum number of digits later on the decimal point is 10.

In this calculator, E notation is used to represent numbers that are besides pocket-size or too big. E notation is an alternative format of the scientific notation a · x^x. For example: 1,103,000 = 1.103 · 10⁶ = i.103E+6. Here Eastward (from exponent) represents "· 10^", that is "times ten raised to the ability of". Eastward-note is usually used in calculators and by scientists, mathematicians and engineers.

• Select the unit to convert from in the left box containing the list of units.
• Select the unit of measurement to catechumen to in the correct box containing the list of units.
• Enter the value (for example, "xv") into the left From box.
• The issue volition appear in the Outcome box and in the To box.
• Alternatively, yous tin enter the value into the right To box and read the upshot of conversion in the From and Result boxes.

We work difficult to ensure that the results presented past TranslatorsCafe.com converters and calculators are correct. However, we do not guarantee that our converters and calculators are free of errors. All of the content is provided "as is", without warranty of any kind. Terms and Weather condition.

If you have noticed an error in the text or calculations, or you need another converter, which y'all did not find here, delight let the states know!

TranslatorsCafe.com Unit Converter YouTube channel

20 Kilo Ohms To Ohms,

Source: https://www.translatorscafe.com/unit-converter/en-US/electric-resistance/13-1/kiloohm-ohm/

Posted by: everettesaitteld.blogspot.com

Share this post