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Q: Among various electrical safety devices, one based on the heating effect of electric current is called a ?
  • A. fuse
  • B. protective relay
  • C. circuit breaker
  • D. surge protector
Correct Answer: Option A - Fuse is an electrical safety device, which provides protection to an electric circuit from excessive current. The fuse is designed to allow current through a circuit. When the current in the electrical circuit exceeds to some maximum amount, it burns the fuse wire so that no longer the circuit is destroyed. The fuse coil is made of an alloy of tin and lead.
A. Fuse is an electrical safety device, which provides protection to an electric circuit from excessive current. The fuse is designed to allow current through a circuit. When the current in the electrical circuit exceeds to some maximum amount, it burns the fuse wire so that no longer the circuit is destroyed. The fuse coil is made of an alloy of tin and lead.

Explanations:

Fuse is an electrical safety device, which provides protection to an electric circuit from excessive current. The fuse is designed to allow current through a circuit. When the current in the electrical circuit exceeds to some maximum amount, it burns the fuse wire so that no longer the circuit is destroyed. The fuse coil is made of an alloy of tin and lead.