A fuse works by melting and breaking the circuit when the current exceeds a safe limit. For this protective action to occur quickly before damage is done to wiring or appliances, the fuse wire must melt at a relatively low temperature, corresponding to the maximum safe current.
A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct ?
Asked in HPPSC HPAS Prelims 2014 · UPPCS Prelims 1998 · Topic: Electric Current (Electrical Power and Energy, Joule heating effect)
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