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Energy can be expressed in joules (SI), calories, kilowatt-hours, British thermal units (BTU), electron volts, and foot-pounds. Energy conversion is essential in physics, engineering, nutrition, and electricity billing.

Hướng dẫn từng bước

1. 11 joule = 1 watt-second (W·s)
2. 21 kilowatt-hour (kWh) = 3,600,000 J = 3.6 MJ
3. 31 food calorie (kcal) = 4,184 J
4. 41 BTU = 1,055.06 J (heat needed to raise 1 lb water by 1°F)

Ví dụ có lời giải