A lightbulb consumed 1100J in 30 minutes. Find Power, resistance, and calculate energy in kWh

30 minutes is 1800 seconds.

Power = energy / time

P = 1100 J / 1800 s

P = 0.611 W

Converting the energy from J to kWh:

1100 J * (1 Ws / 1 J) * (1 kW / 1000 W) * (1 h / 3600 s) = 3.06*10⁻⁴ kWh

To find resistance, you need to be given either the voltage or the current.