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A circuit has a voltage drop of 12.0 V across a 30.0 resistor that carries a current of 0.400 A. What is the power used by the resistor? Use P = VI.

A. 360.0 W
B. 12.0 W
C. 4.80 W
D. 57.0 W

Respuesta :

P=VI
P=12.0×0.400
P=4.80 Watt
So C is right
Cetacea

Option ( c ) is correct.

Using the formula for power

[tex] P= i^2 R [/tex]

P= power

i= current= 0.4 A

R= resistance= 30 ohm

so power= (0.4)² (30)

Power=4.8 W

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