The commercial unit of electric energy is the kilowatt hour (kWh), which is commonly known as ‘unit.’ One kilowatt hour is the amount of energy consumed when a device with a power rating of 1 kilowatt operates for 1 hour.

The unit of electric energy is the watt hour (Wh). One watt hour is the energy consumed when 1 watt of power is used for 1 hour. The relationship between power, time, and electric energy is expressed by the formula: ...

The unit ‘watt’ is relatively small for practical usage, so a larger unit called ‘kilowatt’ is commonly employed. One kilowatt is equivalent to 1000 watts, making it more convenient to express power values in practical scenarios.

For an electric iron consuming 1 kW of electric power at 220 V, the current flowing in the circuit is (1000/220) A, which is approximately 4.54 A. In this case, a 5 A fuse must be used to ensure that ...

Fuses are rated with specific values to indicate the maximum current they can safely handle. These ratings (1 A, 2 A, 3 A, etc.) help in selecting an appropriate fuse for a specific circuit or device, ensuring protection without unnecessary ...