Q.3 (iv) Identify figure and write one use of it :
[Three photographs: (a) two cartridge-type fuse wires with metal caps at both ends; (b) a miniature circuit breaker (MCB) with a switch lever; (c) an analogue ammeter with a pointer and a scale.]
Best answer
Answer: (a) Fuse wire; (b) miniature circuit breaker (MCB); (c) ammeter.
(a) A fuse is connected in series in a circuit. If the current becomes too large, the thin fuse wire melts and breaks the circuit, protecting the appliances from damage. Use: to protect electrical circuits and appliances from excessive current.
(b) An MCB is a modern replacement for the fuse. When the current exceeds the safe value, its switch trips and breaks the circuit automatically; it can be switched on again after the fault is removed. Use: as a safety device in household wiring in place of a fuse.
(c) An ammeter measures electric current and is always connected in series in the circuit. Use: to measure the current flowing through a circuit.
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