Convert 5 kWh into Joules:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 18 × 106 J
One kilowatt-hour is the energy used by a 1000 W device in one hour (3600 s), so 1 kWh = 3.6 × 106 J.
\(1\,\mathrm{kWh}=1000\times3600=3.6\times10^{6}\,\mathrm{J}\)
\(5\,\mathrm{kWh}=5\times3.6\times10^{6}=18\times10^{6}\,\mathrm{J}\)