Calculate the resistance of the filament of a lamp rates 240 V, 40 W
A
240Ω
B
360Ω
C
720Ω
D
1440Ω
E
2880Ω
Verified Correct Answer: D.
Physical Principles & Numerical Solution
R = V2/P = 2402/40 = 1440Ω
Source: Myschool Past Questions Archive (Record #24152)