A car starter consumes 120kJ of energy for 20s of operation. What is the current flowing through
| September 25, 2021 | education
A car starter consumes 120kJ of energy for 20s of operation. What is the current flowing through the starter motor while starting the engine if the voltage is at terminals 12?
We find the power consumed by the starter:
N = W / t, where W is the received energy, t is time.
The same power can be calculated through the voltage U and the current strength I of the source: N = UI.
We compose equality from the right parts of the written expressions:
W / t = UI.
I = W / Ut = 120,000 J / (12V * 20 s) = 500 A.
Answer: 500 A.
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