Problem: A watt is a measure of power (the rate of energy change) equal to 1 J/s.An adult person radiates heat to the surroundings at about the same rate as a 100-watt electric incandescent light bulb. What is the total amount of energy in kcal radiated to the surroundings by an adult over a 25 h period?

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We are asked to calculate the total amount of energy in kcal radiated to the surroundings by an adult over a 25 h period.


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A watt is a measure of power (the rate of energy change) equal to 1 J/s.

An adult person radiates heat to the surroundings at about the same rate as a 100-watt electric incandescent light bulb. What is the total amount of energy in kcal radiated to the surroundings by an adult over a 25 h period?

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Our tutors have indicated that to solve this problem you will need to apply the Dimensional Analysis concept. You can view video lessons to learn Dimensional Analysis. Or if you need more Dimensional Analysis practice, you can also practice Dimensional Analysis practice problems.