Question

The diagram shows an extra lamp wired into an existing $220\,V$ A.C. lighting system. To operate the extra lamp independently a switch should be placed at.

A. 1
B. 2
C. 3
D. 4

Answer 1

Hint: In the above diagram given one extra lamp wired $220V$ to A.C lighting system, for this extra lamp which switch is placed to operate it. Here given four switches in those four switches which one is used for operating an extra lamp. In the complete solution part we are going to discuss it.

Complete step by step answer:
Here we are going to find one switch which is independently used to operate the extra lamp.
Given four switches the correct switch is three because when the wire passes through to the connected line (red) wire of $220V$ A.C lighting system.

The switch is placed in order to regulate current flow through the extra lamp. For this reason the switch three is to operate independently in an extra lamp. In the above diagram the switch three is placed near to the extra lamp so that the third switch with $220V$ is easy to operate independently in the extra lamp.

Hence, the correct answer is option C.

Note: For operating an extra lamp independently the switch three is placed near to that of extra lamp. Here the volt in the wire is $220V$ in line (red) wire the current is passed and the switch is also near the extra lamp.