Ohm's Law

What is the power in the given circuit?

A 32 W

B 80 W

C 500 W

D 16 kW

ANS:A - 32 W

P = I^2 * R.
P = 400 * 10^-3 * 400 * 10^-3 * 200.
= 32000000 * 10^-6,
= 32 * 10^6 * 10^-6,
Cancel 10^6 and 10^-6,
Ans 32.
Then P = 32watt.

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