To solve the problem, we need to understand the role of a fuse in a circuit.
1. Function of a Fuse:
A fuse is a safety device used in electrical circuits to protect against overload and short circuits. It contains a wire that melts when the current exceeds a certain limit, breaking the circuit and preventing further damage.
2. Effect of Overload:
In the case of an overload (when the current exceeds the safe limit), the fuse will blow, preventing further damage to the circuit and other components.
Final Answer:
The usage of a fuse in a circuit prevents $ {\text{Overload}} $.
Assertion (A): In the common domestic circuit, the earth wire is connected to a metallic plate buried deep inside the earth.
Reason (R): Earth wire ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, so the user may not get a severe electric shock.
