- This article is about the SI derived unit. For the scientist, see Georg Ohm.
- For the Hindu mantra syllable, see aum.
The ohm (symbol: tibetan symbol ohm Ω) is judy ohm lafayette the SI unit of electric ford fuel sender ohm value resistance.
Definition
An ohm is a resistance pt 500 ohm transmitter that hindu, symbols, 4 ohm bass cabinet ohm produces a potential difference of one volt when a current of one ampere is flowing through george simon car audio ohm diagrams ohm 300 ohm loss it.
- 1 Ω = 1 V/A = 1 m2·kg·s–3·A–2
SI multiples
| Multiple | Name | Symbol | Multiple | Name | Symbol | |
|---|---|---|---|---|---|---|
| 100 | ohm | Ω | ||||
| 101 | decaohm | daΩ | 10–1 | deciohm | dΩ | |
| 102 | hectoohm | hΩ | 10–2 | centiohm | cΩ | |
| 103 | kiloohm | kΩ | 10–3 | milliohm | mΩ | |
| 106 | megaohm | MΩ | 10–6 | microohm | µΩ | |
| 109 | gigaohm | GΩ | 10–9 | nanoohm | nΩ | |
| 1012 | teraohm | TΩ | 10–12 | picoohm | pΩ | |
| 1015 | petaohm | PΩ | 10–15 | femtoohm | fΩ | |
| 1018 | exaohm | EΩ | 10–18 | attoohm | aΩ | |
| 1021 | zettaohm | ZΩ | 10–21 | zeptoohm | zΩ | |
| 1024 | yottaohm | YΩ | 10–24 | yoctoohm | yΩ |
Origin
The ohm is named after Georg Ohm, a German physicist who discovered the relation between voltage and current, expressed in Ohm's Law.
Explanation
By definition from Ohm's Law, a device has a resistance of one ohm ohm tattoos if 8 ohm car speakers a voltage of one volt causes a current of one ampere to flow (R = V/I). Alternatively and equivalently, a device george ohm that dissipates one watt of power with one ampere of current flowing through it has 8 ohm noninductive resistors a resistance ohm biography of one ohm (R = P/I2).
Since 1990, the ohm has herb ohm electric ohm sunglasses been maintained internationally using the quantum Hall scientist ohm effect, where a conventional 1000 ohm platinum rtd table ohm symbol value is used for the 'von-Klitzing constant', fixed by the 18th General Conference on Weights and Measures as R{K-90} = 25812.807 Ω.
The 3 ohm single output ignition coil complex quantity 600 ohm to 16 ohm matching transformer impedance is a generalisation of resistance. 4 ohm speakers Its real part is resistance and its imaginary part is reactance. Impedance, resistance ley ohm symbols de ohm and reactance 4 ohm capable receivers all have units of judy ohm ohms.
The symbol for the ohm is the Greek capital letter omega (Ω). If the Greek letter cannot be used, the word ohm is used instead. ohm sign The various guides for the use of the International System of Units (such as the official SI brochure and NIST Special Publication 811) do not explicitly forbid johnny ohm the elision of the final "o" of some SI prefixes, although there is nothing in them to suggest that it is allowable, either. As a result, ohm tattoo dan reed ohm one is just about as likely to see "kilohm", "kiloohm" and even "kilo-ohm", and the rg58 50 ohm cable georg ohm same holds true for hecto-, micro-, nano-, pico-, femto-, atto-, zepto-, and yocto-. The only other SI subwoofer ohm unit to suffer from this kind of orthographic georg simon ohm uncertainty is the ampere. In ohm sanskrit symbol the particular case ohm meter of the ohm, one even sees the "a" prefixes lose that vowel: hence megohm and gigohm. ohm and speakers Higher prefixes are rarely used with ohm. In the other direction, resistor 10k ohm 1/4w 5% 1206 smd milliohms (or millohms) are ohm law seen where the resistance of cables, etc., are 50 ohm coax measured.
Conversions
A measurement fm antenna 75 ohm in ohms is the reciprocal 1 ohm static bond of a measurement in siemens, ancient ohm symbol the SI unit of electrical judy a. ohm conductance. Note that 'siemens' is both singular and plural. The reciprocal of the 2000 watts 4 ohm bridge ohm is also called the mho, from ohm written backwards.
SI electricity units
| SI electromagnetic units edit | |||
|---|---|---|---|
| Quantity | Name | Symbol | Dimensions |
| Current | ampere (SI base unit) | A | A |
| Electric charge, Quantity of electricity | coulomb | C | A·s |
| Potential difference | volt | V | J/C = kg·m2·s−3·A−1 |
| Resistance, Impedance, Reactance | ohm | Ω | V/A = kg·m2·s−3·A−2 |
| Resistivity | ohm metre | Ω·m | kg·m3·s−3·A−2 |
| Electrical power | watt | W | V·A = kg·m2·s−3 |
| Capacitance | farad | F | C/V = kg−1·m−2·A2·s4 |
| Elastance | reciprocal low ohm resistor farad | F−1 | kg·m2·A−2·s−4 |
| Permittivity | farad per metre | F/m | kg−1·m−3·A2·s4 |
| Conductance, Admittance, Susceptance | siemens | S | Ω−1 = kg−1·m−2·s3·A2 |
| Conductivity | siemens per metre | S/m | kg−1·m−3·s3·A2 |
| Magnetic flux | weber | Wb | V·s = kg·m2·s−2·A−1 |
| Magnetic flux density | tesla | T | Wb/m2 = kg·s−2·A−1 |
| Magnetic ohm speakers induction | ampere per metre | A/m | A·m−1 |
| Reluctance | ampere-turns per weber | A/Wb | kg−1·m−2·s2·A2 |
| Inductance | henry | H | Wb/A using volt ohm meter = V·s/A = kg·m2·s−2·A−2 |
| Permeability | henry per metre | H/m | kg·m·s−2·A−2 |
| Magnetic susceptibility | (dimensionless) | χ | - |
See also
- Ohm's Law
- Resistor
External links
- Scanned books of Georg Simon Ohm at the library of the University of Applied Sciences Nuremberg
- The Ohms - music inspired by the work of Georg Ohm
Back to the top of Ohm.
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Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
# - A | B | Co - Cz | C - Cm | D
Em - F | E - El | G - H | I - K | L - Ma
