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Ohm's Law - Technical MCQs

Q1:

The power rating for the resistor in the given circuit should be at least ___.

A 1/4 W

B 1/2 W

C 1 W

D 2 W

ANS:B - 1/2 W

I = V/R
I = 8/220 or .036A

P = VI
P = 8 * .036 or .290W

Since .290W > 1/4W(.250) you would need at least 1/2W(.500) resistor to handle the power.