Electrical Motors - Horsepower vs. Voltage and Amps
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Horsepower rating compared to electric motor ampere rating - 115 VAC and 230 VAC - are indicated below:
| Ampere Rating (amps) | ||||
|---|---|---|---|---|
| Power Rating (hp) | 115 VAC | 230 VAC | ||
| Efficiency (%) | ||||
| 50 | 70 | 50 | 70 | |
| 1/4 | 3.2 | 2.3 | 1.6 | 1.2 |
| 1/3 | 4.3 | 3.1 | 2.2 | 1.5 |
| 1/2 | 6.5 | 4.6 | 3.2 | 2.3 |
| 3/4 | 9.7 | 7.0 | 4.9 | 3.5 |
| 1 | 13.0 | 9.3 | 6.5 | 4.6 |
| 1 1/2 | 19.5 | 13.9 | 9.7 | 7.0 |
| 2 | 25.9 | 18.5 | 13.0 | 9.3 |
| 5 | 64.9 | 46.3 | 32.4 | 23.2 |
- 1 hp = 745.7 W
Note that an electric motor is an inductive load. With low power factor it pulls lot of amps producing little hp output.
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