Calculate the resistance of the filament of a l... - WAEC Physics 1990 Question
Calculate the resistance of the filament of a lamp rates 240 V, 40 W
A
240Ω
B
360Ω
C
720Ω
D
1440Ω
correct option: d
R = V2/P = 2402/40 = 1440Ω
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