A particular frost-free refrigerator uses about 710kWh of electrical energy per year. Express this amount of energy in J, kJ, & Cal.

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Physics

Reese Thornton

23 June, 07:28

A particular frost-free refrigerator uses about 710kWh of electrical energy per year. Express this amount of energy in J, kJ, & Cal.

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Desmond Ochoa · Answer 1

A particular frost-free refrigerator uses about 710kWh of electrical energy per year. You are to express this amount of energy in J, kJ, & Calories.

1 year (365 days / 1 year) (24 hours / 1 day) (3600s / 1h) = 31,536,000s

710 kWh/yr (1 yr) = 710 kWh

710 x 10^3 Wh = 710 x 10^3 (J/s) (31,536,000s) = 2.24 x 10^13 J

2.24 x 10^13 J = 2.24 x 10^10 kJ = 5.35 x 10^12 cal