Power Converter
Power measures the rate of energy transfer or work done per unit time. The SI unit is the watt (W = J/s). Power converters convert between watts, kilowatts, horsepower, BTU/hr, and calories/second.
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Tip: Your electricity bill is in kWh (kilowatt-hours). Power (kW) × Time (hours) = Energy (kWh). A 2 kW heater running 5 hours = 10 kWh. At $0.15/kWh, that's $1.50.
- 11 watt = 1 joule/second
- 21 kilowatt (kW) = 1,000 W
- 31 mechanical horsepower (hp) = 745.7 W
- 41 metric horsepower (PS) = 735.5 W
- 51 BTU/hr = 0.2931 W
| Unit | Watts | Context |
|---|---|---|
| 1 milliwatt (mW) | 0.001 W | Laser pointer, radio signal |
| 1 watt (W) | 1 W | LED light, small motor |
| 100 W | 100 W | Traditional light bulb, human resting |
| 1 kW | 1,000 W | Hair dryer, small heater |
| 1 hp (mechanical) | 745.7 W | Small engine |
| 1 kW | 1.341 hp | Conversion reference |
| 1 MW | 1,000,000 W | Small power plant |
| 1 GW | 10⁹ W | Large nuclear reactor |
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Fun Fact
James Watt defined horsepower by measuring how much coal a horse could lift in a minute — 33,000 foot-pounds per minute. He intentionally set it high (actual horse output is ~0.7 hp sustained) so his steam engines could claim superiority.
References
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