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.
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Pro Tip
Your electricity bill charges per kWh. To estimate: (watts × hours) / 1000 = kWh. A 1000W microwave running 1 hour = 1 kWh. At $0.15/kWh, that's 15 cents.
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Did You Know?
The average human body uses about 2,000 kcal/day = 8.36 MJ. In watts, that's 96.8 W — roughly equivalent to a 100-watt light bulb. You are generating as much heat as a light bulb, all day, every day.
References
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