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Electrical Units
By BYJU'S Exam Prep
Updated on: September 25th, 2023
Standard units of electrical measurement used for the expression of voltage, current and power are____________.
Fill in the blank with a suitable answer.
Table of content
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 |