Discussion
1 kWh expressed in megajoules is
Answer: B
Correct answer: 3.6
A kilowatt hour is a thousand watts for 3,600 seconds: \[ 1000 \times 3600 = 3.6\times10^6\ \mathrm{J} = 3.6\ \mathrm{MJ}. \] The conversion is worth knowing by heart, since energy accounts routinely mix electrical units with thermal ones and the two must be brought to a common basis before anything can be added.
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