- For the different meanings of Ampère, see the disambiguation page.
The ampere (symbol: A) is the andremarie ampere SI base unit of electrical current equal to one coulomb per second. It is named after André-Marie Ampère, one of the main discoverers of electromagnetism.
Definition
The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, cost of one ampere and placed 1 m apart in vacuum, would produce ampere rating between 80 ampere schottky diodes these did andre marie ampere have a family conductors a force equal people search ampere ampere starters and alternators to 2 x 10–7 newton per metre of length.
Explanation
Because it is a base unit, the picture of ampere definition of the ampere is not tied to any other electrical unit. micro miniature 6 ampere smt relays The definition for the ampere is equivalent to ampere hours fixing a value of the permeability of vacuum to μ0 = 4π × 10−7 H/m. Prior to 1948, the so-called "international ampere" was used, defined in terms of the electrolytic deposition ampere meter rate of silver. ampere automotive The older unit is equal to 0.999 85 A.
The ampere is most accurately realised using an ampere balance, ampere andre-marie - electricity but is in practice maintained via Ohm's Law andre ampere from the units of voltage and resistance, the volt and the ohm, since the latter two andre-marie ampere can be tied to physical phenomena that are relatively easy to reproduce, the Josephson junction and the quantum Hall effect, respectively.
The unit andre marie ampere of electric charge, the coulomb, is defined in terms of the ampere: one coulomb is the ampere amount of electric charge (formerly quantity of electricity) carried in a current of one ampere flowing for one second. 7 ampere charge controller Current (electricity), then, is the rate at which charge flows through a wire or surface. One ampere of current ampere software (I) is equal to a flow of one coulomb of ampere to kilowatt charge (Q) per second ampere ampere spa meter ampere and wattage calculation rv of time (t):
Since a coulomb is approximately ampere andre marie contribution equal to 6.24 × 1018 elementary charges, one ampere is equivalent to 6.24 × 100 ampere receptacle 1018 elementary charges, such as electrons, moving ampere capital through a surface in one second. More amere marie ampere precisely, using chemical consumption per ampere in plating the SI definitions for the conventional values of the Josephson and von Klitzing constants, what is an ampere the ampere can be defined as exactly 6.241 509 629 152 65 × 1018 elementary charges per second.
SI multiples are formed from a standard set of prefixes and a standard set of units. In the case of ampere, this milli ampere results in some multiples having double dc ampere meter vowels such as megaampere. Some people treat multiples with double vowels in exceptional ways, for example by eliminating a letter (e.g. megampere) or inserting a hyphen (e.g. mega-ampere). There is no support in SI publications for treating any multiple in an exceptional what's a milli ampere ampere automotive hotel ampere in paris corp way.
SI multiples
| Multiple | Name | Symbol | Multiple | Name | Symbol | |
|---|---|---|---|---|---|---|
| 100 | ampere | A | ||||
| 101 | decaampere | daA | 10–1 | deciampere | dA | |
| 102 | hectoampere | hA | 10–2 | centiampere | cA | |
| 103 | kiloampere | kA | 10–3 | milliampere | mA | |
| 106 | megaampere | MA | 10–6 | microampere | µA | |
| 109 | gigaampere | GA | 10–9 | nanoampere | nA | |
| 1012 | teraampere | TA | 10–12 | picoampere | pA | |
| 1015 | petaampere | PA | 10–15 | femtoampere | fA | |
| 1018 | exaampere | EA | 10–18 | attoampere | aA | |
| 1021 | zettaampere | ZA | 10–21 | zeptoampere | zA | |
| 1024 | yottaampere | YA | 10–24 | yoctoampere | yA |
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 electrical ampere = kg−1·m−2·A2·s4 |
| Elastance | reciprocal 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 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 = 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 | - |
Human electrical shock
Current flowing through the body ampere capital management is more important than voltage when it comes to the actual hazard to human health. ampere andre marie The amount of current depends on the voltage, skin resistance and the current ampere ampere hour percent tubes capacity of the voltage source. An electric supply of 50 volts or more is considered potentially dangerous. See High-voltage hazards. Household current in North America runs at 120 volts. High voltage power lines carry 50 kilovolts or more.
There are situations where high voltages do not produce enough current, or do not produce 50 ampere 250 volt 3 phase electrical plug it long enough, to be dangerous. For example, walking across a carpet may generate 1,500 to 35,000 volts, opening a plastic bag can produce 2,000 to 12,000 volts. When you feel a static discharge you are experiencing a minimum of ampere meters 3,000 volts —anything less is below the marie andre marie ampere biography ampere threshold of human sensation. On the other hand, electric circuits in any device connected to the mains or marked with a high voltage warning quotes by andre ampere should be considered potentially dangerous.
A weak current of 0.001 A will likely not be felt at all; 200 ampere rated meter socket power outlet panel 0.015 A to ampere conversion chart 0.020 A will cause a painful shock and loss of muscle control (which often means you will not be able to let go of the line). Current as low as 0.1 A can be fatal. Household electrical outlets are more than capable of delivering formula for candela to ampere such amperages; for did marie ampere get married example, a fairly heavy-duty appliance such as a space heater can draw up to 15 A amdre ampere without blowing the fuses or tripping the breakers. For comparison, an average lightning strike carries as much as 30 to 300 kiloamperes biography of andre marie ampere —though only very briefly.
See also
- SI
- Ohm's Law
- A short history of the SI units in electricity
Back to the top of Ampere.
Provided by wikipedia.org
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
