A watt is a measure of power (the rate of energy change) equal
to 1 J/s. (b) 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 24 h period?
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Master Nature of Energy with a bite sized video explanation from Jules Bruno