Q: Does a fuse in a circuit control, the potential difference or the current?
Ans: Fuse in a circuit controls the current. If the current increases from a certain limit produces large amount of heat energy which melts the wire of fuse. Due to which circuits breaks and the supply of the current goes off.
FURTHER EXPLANATION:
A fuse is a safety device that is connected in series with the livewire in the circuit to protect the equipments when excess current flows. It is short and thin piece of metal wire that melts when large current passes through it. If a large, unsafe current passes through the circuit, the fuse melts and breaks the circuit before the wires become very hot and cause fire. Fuses are normally rated as 5 A, 10 A,
13 A,30 A, etc. Following safety measures should be taken while using fuses in household electrical circuits:
1. Fuses to be used should have slightly more rating than the current which the electrical appliance will draw under normal conditions. For example, for a lightning circuit choose a 5 A fuse as the current drawn by each lamp is very small (about 0.4 A for a 100 W lamp). In such circuit, 10 lamps of 100 W can be safely used as the total current drawn is only 4 A which can be calculated using the formula
P = VI
2. Fuses should be connected in the livewire so that the appliance will not operate after the fuse has blown.
3. Switch OFF the main before changing any fuse.
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