SAT Subject Physics Practice Question 197: Answer and Explanation
43. How much current does a 60-watt lightbulb draw if it operates at a voltage of 120 volts?
A. 0.25 amp
B. 0.5 amp
C. 2 amps
D. 4 amps
E. 30 amps
Correct Answer: B
We use the equation for the power dissipated by a resistor, P = IV.