JAMB - Physics (2002 - No. 30)
When connected to a mains of 250V, the fuse rating in the plug of an electric device of 1 KW is
2 A
3 A
4 A
5 A
Vysvětlení
1 KW = 1000 watts, power P = IV, thus for a mains of 250 V, the maximum permissible Current I = 1/V = 1000/250 = 4 A
Thus the fuse rating in the plug should be 4 A
Thus the fuse rating in the plug should be 4 A