Resistance and Power

What is the power dissipated by a 1.2 k resistor with 12 volts across it?

A 12 W

B 1.2 W

C .12 W

D 12 mW

ANS:C - .12 W

r=1.2kohm
v=12 volts
p=v^2/r
=12^2/(1.2*1000)
=(12*12)/1200
=0.12

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