Multiple Choice
Which type of energy is primarily stored in a battery?
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8. Thermochemistry
Nature of Energy
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
An energy efficient refrigerator uses 780 kWh of electrical energy per year. How many kilocalories of electricity does it use in three years?
A
2.0 x 106 kcal
B
8.3 x 105 kcal
C
2 x 106 kcal
D
8.3 x 106 kcal
Verified step by step guidance1
First, understand the relationship between kilowatt-hours (kWh) and kilocalories (kcal). 1 kWh is equivalent to 860 kcal.
Calculate the total energy consumption in kWh for three years by multiplying the annual consumption by 3: 780 kWh/year * 3 years.
Convert the total energy consumption from kWh to kcal using the conversion factor: Total kWh * 860 kcal/kWh.
Ensure the units are consistent and correctly converted from kWh to kcal.
Compare the calculated value with the given options to determine the correct answer.
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