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# What is the energy in joules?

What is the total amount of energy stored in a 12 V, 90 A·h car battery when it is fully charged?

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- 1 decade agoFavorite Answer
1 Amp Hour is 3600 coulombs

A Watt is a Joule / s

1 J= 1C*V

Thus,

90 Ah * 3600 C/Ah = 324,000 coulombs.

324,000 coulombs * 12 volts = 3,888,000 joules.

- TJ CLv 51 decade ago
I am no battery designed. but I think

90 A·h means 90 amps * hour

so energ saved is 12 volts * 90 amp * 3600 seconds

= 3888000 j

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