A television studio spotlight is operating at full brightness. The bulb inside the spotlight is supplied with 230 V, and the current through the lamp filament is 27 A.
(a)[2]
Calculate the power of the lamp.
(b(i))[1]
The spotlight is left on at full brightness. Calculate the energy transformed by the lamp in 30 minutes.
(b(ii))[2]
Electricity costs 23 cents for each kilowatt-hour (kWh). Calculate the cost of running the spotlight for 30 minutes.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply P = VI” …