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One kilowatt hour expressed in joules is

  • A.60 kilojoules
  • B.36 megajoules
  • C.3.6 megajoules
  • D.1000 joules

Answer: C

A kilowatt is a thousand joules per second, and an hour is 3600 seconds, so the product is \( 3.6 \times 10^{6} \) joules. The kilowatt hour survives as a unit because it is a convenient size for billing, not because it is coherent with the rest of the system.

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