MAXWELL'S EQUATIONS AND ELECTROMAGNETIC WAVES — Edward Purcell & David Morin
Physics — E&M · light-bulb
Problem
A 120 volt (rms), 60 Hz line provides power to a 40 watt light bulb. By what factor will the brightness decrease if a 10 μF capacitor is connected in series with the light bulb? (Assume that the brightness is proportional to the power dissipated in the bulb's resistor.)