Physics
The purpose of earthing in a household circuit is to :
- provide a connection to appliance
- complete the circuit
- prevent electric shock
- increase the voltage
Answer
prevent electric shock
Reason — Earthing in a household circuit involves connecting the metal parts of electrical appliances and installations to the ground (earth) through a conductor. This ensures that in the event of a fault, such as a short circuit, any excess current flows safely to the ground rather than through a person touching the appliance or installation.
Related Questions
Figure below shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:
(a) How is the bulb A connected with the mains? At what voltage does it glow?
(b) How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow?
(c) How is the glow of bulbs A and C affected if bulb B gets fused?
(d) How is the glow of bulbs B and C affected if bulb A gets fused?
In a three pin plug, the longest pin is :
- live pin
- neutral pin
- earth pin
- can be any
An alloy of lead and tin is used as the material of the fuse wire because its melting point is …………… and specific resistance is …………… ,
- high, high
- low, high
- low, low
- high, low
The rating of a fuse connected in the lighting circuit is:
- 15 A
- 5 A
- 10 A
- zero