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Two people asked for detail on the power transfer involved in eating -- so here is a calculation:

Since it is Halloween day one observes a lot of people can eat a candy bar in about a minute. A Snickers bar has about 280 Calories of energy - that's about 325 watt-hours or 19.5 kilowatt-minutes. Power is just the rate of energy transfer so if you eat it in a minute the power is simply 19.5 kilowatts. Note that the electric element on your range is about 1.8 kilowatts. Another way of looking at it is to note that is about 26 horsepower.

People are very efficient when it comes to transferring energy into our bodies.

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