SOLUTION: A light bulb designed to operate in a 120 V circuit has a resistance of 192 Ω. At what rate does the bulb use electric energy? (Power is the rate at which energy is used.)
Power P = ,
where V is voltage in volts, R is resistance in ohms.
Substitute and calculate P = in watts.
See this Wikipedia article
https://en.wikipedia.org/wiki/Electric_power