Electrical Engineering XYZ MCQs
Which of following is an example of voltage clamping device;
- Heat sink
- Aluminium block
- Metal oxide varistor
- Fast acting fuse
Correct answer: 3. Metal oxide varistor
Explanation: A metal oxide varistor is a voltage-dependent resistor that is used to protect circuits from excessive transient voltage by clamping the voltage to a safe level. When a voltage spike occurs, the MOV’s resistance decreases significantly, allowing it to conduct current and diverting the excess voltage away from the protected circuit.