A person in the United States consumes 2000 Calories of food per day.
What fraction of the average per capita energy use, as indicated in Table 2.1, does this
represent?

Name: A person in the United States consumes 2000 Calories of food per day. What fraction of the average per capita energy use, as indicated in Table 2.1, does this represent?
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Question

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The Answer is From the Table the per capita power consumption is 11,730 W. This represents

( 11730 \mathrm {~J} / \mathrm { s } ) imes ( 24 \mathrm {~h} / \mathrm { d } ) imes ( 3600 \mathrm {~s} / \mathrm { h } ) = 1.01 imes 10 ^ { 9 } \mathrm {~J} / \mathrm { d }

Food consumption represents

( 2000 \mathrm { Cal } / \mathrm { d } ) imes ( 4180 \mathrm { Ca } / / \mathrm { J } ) = 8.37 imes 10 ^ { 6 } \mathrm {~J} / \mathrm { d }

or

100 imes \left( 8.37 imes 10 ^ { 6 } \mathrm {~J} / \mathrm { d } ight) / \left( 1.01 imes 10 ^ { 9 } \mathrm {~J} / \mathrm { d } ight) = 0.83 \% ext { of energy use }

A Person in the United States Consumes 2000 Calories of Food