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प्रश्न
An electric iron is rated 220V, 2kW.
1) if the iron is used for 2h daily find the cost of running it for one week if it costs 4.25 per kWh
2) Why is the fuse absolutely necessary in a power circuit?
उत्तर
Electric iron = 2 kW
each work 2 hours daily
one day = 2 × 2 = 4 kW
consumption of seven days ( week )= 7 × 4 = 28 kW
cost for running it for one week = 28 × 4.25 = 119 ₹
2) if excessive current passes through the type, it melts thus fuse is used to prevent excessive current passing through the device.
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