When connected to a mains of 250V, the fuse rating in the plug of an electric device of 1 KW is

Answer Details

The fuse rating in the plug of an electric device of 1 KW when connected to a mains of 250V can be calculated using the formula P = V x I, where P is the power in watts, V is the voltage in volts, and I is the current in amperes.
In this case, the power of the device is 1 KW (or 1000 watts), and the voltage is 250V. So we can rearrange the formula to find the current:
I = P / V = 1000 / 250 = 4 amps
Therefore, the correct fuse rating for this electric device would be 4 amps. This is because the fuse should be rated slightly higher than the expected current, to ensure that it can handle any momentary surges or spikes in current without blowing.
So, option (C) 4 A is the correct answer.