Refrigeration and Air Conditioning Mechanics (313A) Advanced Practice Exam

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How much horsepower does a dual voltage motor develop at 110V if it produces 5 hp at 220V?

2.5 hp

5 hp

When dealing with dual voltage motors, it is essential to understand how voltage affects horsepower (hp) output. A dual voltage motor can operate at both 110V and 220V, with the key relationship between voltage and horsepower being that horsepower is proportional to the square of the voltage.

In this case, the motor produces 5 hp when operating at 220V. If we want to determine the horsepower at 110V, we can use the formula that relates horsepower to voltage:

Horsepower at a lower voltage can be derived by the following relationship:

Horsepower at lower voltage = Horsepower at higher voltage × (Lower voltage / Higher voltage)²

Plugging in the values:

- Horsepower at 220V = 5 hp

- Lower voltage = 110V

- Higher voltage = 220V

Substituting into the formula:

Horsepower at 110V = 5 hp × (110V / 220V)²

Horsepower at 110V = 5 hp × (0.5)²

Horsepower at 110V = 5 hp × 0.25

Horsepower at 110V = 1.25 hp

Thus, the correct horsepower that the dual

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10 hp

1.25 hp

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