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Electrical Units

Unit

 

 Notes

Volt

V

Measure of potential difference

Ampere

A

Measure of current flow

Watt W Unit of power: 1 volt supplying one ampere

Coulomb

C

Unit of charge: 1 ampere flowing for 1 second.  Mostly used for scientific purposes - the day-to-day measure, used for example in determining the charge available from a battery, is the Ampere-hour (Ah) or milliAmpere-hour (mAh).

Ohm

Measure of resistance or impedance

Farad

F

Measure of capacitance

Henry

H

Measure of inductance

Mho

Measure of conduction: Reciprocal ohm  =  1/ohms (rarely used)

In an electrical circuit the current (I) flowing through the circuit depends upon the voltage applied to it (V) and the resistance of the circuit (R):

I = V
R

The Power in the circuit (P) is the product of the voltage and the current:

P = V * I

See also Energy & Work.

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