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Biology

Your Body's Daily Battery Bill

Quick fact

The human body continuously converts chemical energy from food into heat and work, averaging about 100 watts of power—similar to a bright incandescent light bulb. This energy, measured in kilocalories, can be directly compared to the watt-hour capacity of batteries.

Why this is interesting

If you had to power yourself with AA batteries, how many would you need just to get through a single day?