Q:

How many watts equal 1 horsepower?

A:

The question of how many watts equal 1 horsepower depends on how you define horsepower. One mechanical horsepower unit is approximately equal to 745.7 watts. One electrical horsepower, used for rating electrical motors, is equal to 746 watts.

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Horse power was originally defined as the power output of a single common draft animal. One horse could sustain the work of 1 horsepower. As steam engines began to supplant horses during the Industrial Revolution, the unit "horsepower" came in to use to define the power output of mechanical and then electrical engines. James Watt, an inventor of the late 18th and early 19th century, originally developed the horsepower unit; in 1882, the SI unit of power was named the watt in his honor.

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Related Questions

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To convert between watts to kilowatt-hours, first convert to kilowatts by dividing by 1,000, then multiply by the number of hours that the device is in use. For example, a 60-watt bulb that is on for five hours uses 0.06 kW per hour, for a total of 0.3 kWh.

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The simplest conversion formula to convert watts to amps is based on the formula for amps, which is power (in Watts) divided by Volts. This is written as I(Amps) = P(Watts) / V(Volts). By simply rearranging this formula, it is easy to convert amps to watts and vice versa.

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To convert watts to lumens, first find out the efficacy rating, which is in lumens per watt. The formula for this conversion is lumens = watts x (lumens per watt).