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A 12.0 V car battery is being used to power the headlights of a car. Each of the two headlights has a power rating of 37.7 Watts. The number
Question
A 12.0 V car battery is being used to power the headlights of a car. Each of the two headlights has a power rating of 37.7 Watts. The number of electrons that pass through the car battery each second is ___ x 1019. Assume three significant digits in your answer. You do not need to use scientific notation when you enter your answer.
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Physics
3 years
2021-08-27T07:23:43+00:00
2021-08-27T07:23:43+00:00 1 Answers
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Answer:
3.921*10^19 electrons
Explanation:
To find the number of electron that trough the car battery you first calculate the current by using the following formula, which relates the power with the voltage:
(1)
P: power of both headlights = 2(37.7W) = 75.4 W
I: current = ?
V: voltage of the battery = 12.0 V
You solve the equation (1) for I:
Next, you use the equivalence 1C = 6.241*10^18 electrons:
The number of electrons that cross the battery per second is 3.921*10^19 electrons