Electrical Units

By Varadi Hema|Updated : July 22nd, 2022

Standard units of electrical measurement used for the expression of voltage, current and power are____________.

Fill in the blank with a suitable answer.

Answer:

Units used for measurement of electrical quantities voltage, current and power are Volt, Ampere and Watts.

Solution:

Electric current is the rate of change of charge with respect to time,

i=dq/dt

The electrical unit used for measuring current is called Ampere,

1 Ampere= 1 coulomb/sec

Current --- Ampere (A)

Voltage is the energy required to move a unit charge through an element. So, the voltage between two terminals is named A, and B is the energy required to move a test charge between these terminals.

VAB=dW/dq

and the electrical unit used to measure the voltage is Volt.

1 Volt=1joule/coulomb

Electric power is the rate at which an element absorbs energy with respect to time.

P=dW/dt=dW/dq×dq/dt=V×I

And unit used to measure power is Watt.

And some standard electrical units are mentioned below,

Electrical parameter

Unit used for measuring

equation

Charge 

Coulomb (C)

 

Current 

Ampere (A)

i=dq/dt

Voltage 

Volt (V)

V=dW/dt

Power 

Watts (W)

P=V.I

resistance

Ohm 

R=V/I

Conductance 

Siemen (S)

G=I/V

Inductance 

Henry (H)

v=L.(di/dt)

Capacitor 

Farad (F) 

C=q/v

Impedance 

Ohm 

Z=√R2+X2

Frequency 

Hertz (Hz)

f=1/T

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