Try our engine horsepower calculator to calculate the power of a motor. Horsepower were later used to measure the power output of piston and turbine engines and electrical motors. The term horsepower was adopted by Scottish inventor James Watt to measure the power output of his steam engine and to compare that power with that of horses horses. īoiler horsepower can be abbreviated as hp(S) for example, 1 boiler horsepower can be written as 1 hp(S). One boiler horsepower is equal to the power needed to evaporate 34.5 pounds in one hour. Boiler Horsepowerīoiler horsepower is used to measure the power of a boiler to generate steam. For example, 1 metric horsepower can be written as 1 hp(M), 1 PS, 1 cv, 1 hk, 1 pk, 1 ks, or 1 ch. Metric horsepower can be abbreviated as hp(M), and are also sometimes abbreviated as PS, cv, hk, pk, ks, or ch. The metric horsepower is a non-SI metric unit for power. One metric horsepower is equal to 735.49875 watts. Do a quick conversion: 1 watts 0.0013404825737265 horsepower using the online calculator for metric conversions. One metric horsepower is the power needed to one metric horsepower as the lift a 75 kilogram mass at at one meter per second. Electric horsepower can be abbreviated as hp(E) for example, 1 electric horsepower can be written as 1 hp(E). The electric horsepower is a US customary and imperial unit of power. One electric horsepower is equal to exactly 746 watts. Electric HorsepowerĮlectric horsepower is used to measure the output of electric motors and other electrical machines in the US. Mechanical horsepower can be abbreviated as hp(I) for example, 1 mechanical horsepower can be written as 1 hp(I). The mechanical horsepower is a US customary and imperial unit of power. One mechanical horsepower is equal to 745.69987158227022 watts. Mechanical horsepower is often used to measure the output of engines and motors in North America. One electric horsepower is equivalent to 746 watts and one mechanical horsepower is equivalent to 745.699872 watts. The power in watts is equal to the current in amperes times the potential difference in volts.Ĭombining this with Ohm's Law, it's also possible to express the power in watts using resistance in addition to volts and amps.Įlectric and mechanical are the most commonly used types. Using Watt's Law, it's possible to express the power in watts as an expression using current and voltage. Watt's Law states the relationship between power, current, and voltage. Watts can be abbreviated as W for example, 1 watt can be written as 1 W. The watt is the SI derived unit for power in the metric system. One watt is also equal to the power produced in a circuit with a voltage potential of one volt with a current of one amp. So, converting hp to kw is necessary to complete the electrical design for load control panel elements, cables and other protection devices.One watt is the power equal to the rate of energy of one joule per second in an electrical circuit. That’s why we convert motor power from horse power to kilo watt.Īt work, if you are designing an electrical system for a load or a group of loads you will need to calculate exactly the load power in watt or kilowatt (kw) not in horsepower (hp).īut if the load is a single phase or a three phase induction motor, The power of the motor on the name plate is given in hp not in kw. Watt is the unit of electrical power at all electrical equations. Why do we convert motor power to to kilowatt?Īs electrical engineers, we are looking at loads from electrical side.
The lower the voltage the higher the current consumption the lower the motor.
#Watts to horsepower how to
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Choose the right motor sizing for the mechanical load.
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