Question 1

What is a joule?

Accepted Answer

A joule is the SI unit of energy. One joule equals the amount of energy needed to produce one watt of power for one second.

Question 2

How many calories are in a kilowatt-hour?

Accepted Answer

One kilowatt-hour equals approximately 860,420 calories. This conversion is useful when comparing electrical energy to thermal energy.

Question 3

What is the difference between calories and kilocalories?

Accepted Answer

One kilocalorie (kcal) equals 1,000 calories. In nutrition, when we refer to "calories" in food, we actually mean kilocalories.

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