An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5\Omega. What is the power absorbed in the Coil?
A
5W
B
6W
C
7W
D
8W
Verified Correct Answer: A.
Physical Principles & Numerical Solution
I = 1A, F = 800 cycles/s = 800Hz
R = 5\Omega, L = 2.5mH
P = I\(^2\)R = I\(^2\) \times 5 = 5W
Source: Myschool Past Questions Archive (Record #55571)