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Electrical Units & Definitions

Electrical Units Table

Unit Name

Unit Symbol

Quantity

Ampere (amp)

A

Electric current (I)

Volt

V

Voltage (V)

Watt

W

Electric power (P)

Ohm

Ω

Resistance (R)

Hertz

Hz

Frequency (f)

Ampere-hour

Ah

Electric charge (Q)

Kilowatt-hour

kWh

Energy (E)

Volt-Ampere

VA

Apparent power (S)

Volt-Ampere-Reactive

var

Reactive power (Q)

Farad

F

Capacitance (C)

Henry

H

Inductance (L)

Coulomb

C

Electric charge (Q)

Joule

J

Energy (E)

 


 

Electrical Units Definitions

Volt (V)

Volt is the electrical unit of voltage.

One volt is the energy of 1 joule that is consumed when electric charge of 1 coulomb flows in the circuit.

1V = 1J / 1C


Ampere (A)

Ampere is the electrical unit of electrical current. It measures the amount of electrical charge that flows in an electrical circuit per 1 second.

1A = 1C / 1s


Watt (W)

Watt is the electrical unit of electric power. It measures the rate of consumed energy.

1W = 1J / 1s

1W = 1V · 1A


Ohm (Ω)

Ohm is the electrical unit of resistance.

1Ω = 1V / 1A

 

Hertz (Hz)

Hertz is the unit of frequency. It measures the number of cycles per second.

1 Hz = 1 cycles / s


Ampere-hour (Ah)

Ampere-hour is a unit of electric charge.

One ampere-hour is the electric charge that flow in electrical circuit, when a current of 1 ampere is applied for 1 hour.

1Ah = 1A · 1hour

One ampere-hour is equal to 3600 coulombs.

1Ah = 3600C


Kilowatt-hour (kWh)

Kilowatt-hour is a unit of energy.

1kWh = 1kW · 1h = 1000W · 1h


Farad (F)

Farad is the unit of capacitance. It represents the amount of electric charge in coulombs that is stored per 1 volt.

1F = 1C / 1V


Henry (H)

Henry is the unit of inductance.

1H = 1Wb / 1A


Coulomb (C)

Coulomb is the unit of electric charge.

1C = 6.238792×1018 electron charges


Joule (J)

Joule is the unit of energy.

1J = 1 kg · 1(m / s)2

 

 

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