Determine the energy consumption in 20 seconds in a car light bulb rated for 12 V at 3.5 A.
| January 2, 2021 | education
Initial data: t (operating time of a car light bulb) = 20 s; U (voltage for which the car light is designed) = 12 V; I (current) = 3.5 A.
1) Determine the calculated active load (power) of a car light bulb: P = U * I = 42 W.
2) Determine the power consumption in 20 seconds: W = P * t = 42 * 20 = 840 J.
Answer: In 20 seconds, a car light will consume 840 J of energy.
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