A lightbulb with resistance is connected to a constant-voltage source
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
A lightbulb with resistance R is connected to a constant-voltage source. The filament is replaced with one of resistance 2R. Which statement best describes the change in the bulb’s power output?
(a) The power doubles.
(b) The power remains the same.
(c) The power is cut to one-half.
(d) The power is reduced to one-quarter.