How many joules are in one kilojoule?

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Multiple Choice

How many joules are in one kilojoule?

Explanation:
The concept here is metric prefixes. The prefix kilo- means 10^3, or 1000. So a kilojoule is 1000 joules. That’s why one kilojoule equals 1000 J. If you’re converting the other way, 1 J is 0.001 kJ. The other amounts—1 J being too small for a kilojoule, and 1,000,000 J corresponding to a megajoule—fit with those same prefix rules.

The concept here is metric prefixes. The prefix kilo- means 10^3, or 1000. So a kilojoule is 1000 joules. That’s why one kilojoule equals 1000 J. If you’re converting the other way, 1 J is 0.001 kJ. The other amounts—1 J being too small for a kilojoule, and 1,000,000 J corresponding to a megajoule—fit with those same prefix rules.

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