The electrical power P drawn from a generator by a light bulb of resistance R is P = V^2/R, where V is the line voltage. The resistance of bulb B is 75% greater than the resistance of bulb A. What is the ratio P_B/P_A of the power drawn by bulb B to the power drawn by bulb A, if the line voltages are the same?
A. 0.33.
B. 0.57.
C. 1.3.
D. 1.8.
Answer:B
The electrical power P drawn from a generator by a light bulb of resistance R is P = V^2/R, where V is the line voltage. The resistance of bulb B is 75% greater than the resistance of bulb A. What is the ratio P_B/P_A of the power drawn by bulb B to the power drawn by bulb A, if the line voltages are the same?
A. 0.33. B. 0.57. C. 1.3. D. 1.8.