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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.
Guide étape par étape
- 11 joule = 1 watt-second (W·s)
- 21 kilowatt-hour (kWh) = 3,600,000 J = 3.6 MJ
- 31 food calorie (kcal) = 4,184 J
- 41 BTU = 1,055.06 J (heat needed to raise 1 lb water by 1°F)
Exemples résolus
Entrée
1 kWh
Résultat
= 3,600,000 J = 3.6 MJ = 860 kcal
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