Voltage and Current - Technical MCQs

Q1:

A switch is a device that:

A short circuits complex circuits

B holds a fuse

C has double poles

D opens or completes a current path

ANS:D - opens or completes a current path

A short circuit is simply a low resistance connection between the two conductors supplying electrical power to any circuit. This results in excessive current flow in the power source through the 'short', and may even cause the power source to be destroyed.

If a fuse is in the supply circuit, it will do its job and blow out, opening the circuit and stopping the current flow.