convert watts to hpThe headlights of a moving car draw about 9 A from the 12 V alternator, which is driven by the engine. Assume

Question

3 years ago

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convert watts to hpThe headlights of a moving car draw about 9 A from the 12 V alternator, which is driven by the engine. Assume

the alternator is 85% efficient (its output electrical power is 85% of its input mechanical power), and calculate the horsepower the engine must supply to run the lights.

Physics

1 answer:

iVinArrow [24] · Answer 1 · 2022-02-19T12:53:21+03:00

iVinArrow [24]3 years ago

4 0

Answer: 0.17hp

Explanation:

Power output = power input × 85%

Power output = power input × 0.85

Power input = IV/0.85

Power input = 9×12/0.85

Power input = 108/0.85

= 127.058 watts

Converting to horse power = 127.058W × 1horse power/745.7W

= 127.058 × 0.001341

= 0.17hp