How do determine the power of a motor?

Answer 1

It depends on the refrigerator. Mostly the average is about 240~280v

So i wouldn't touch it if I were you!

Answer 2

Answer

The following quote applies to mechanical horsepower.
Wikipedia, the free encyclopedia says, "The term "horsepower" was created by the engineer James Watt in 1782. Watt (1736 to 1819) is most famous for his work on improving the performance of steam engines. Watt was working with ponies lifting coal at a coal mine, and he wanted to define the power available from one of these animals. He found that, on average, a mine pony could do 22,000 foot-pounds (lift a bucket of coal weighing 22,000 lb. a distance of 1-foot) of work in a minute. He then increased that number by 50 percent and fixed the measurement of horsepower at 33,000-foot-pounds of work in one minute." Under this system, one horsepower is defined as:

1 hp = 33,000 ft·pound-force·min−1 = exactly 745.69987158227022 W

Source: http://en.wikipedia.org/wiki/Horsepower

Answer 2

The Wikipedia answer above is a perfect definition of mechanical horsepower, which engine designers call BrakeHorsePower, or BHP, but doesn't tell us how to calculate a motor's power.

This is not so easy to do. Taking the simple example of an electric motor, measuring (or specifying) the power consumed by the motor, then dividing kW by 745 gives you some idea. It won't be quite right, because some of the power going in is lost in resistance losses in the motor's electrical circuit. Allowing for this gives the gross mechanical power produced, but it's not all available to the outside world. Some is lost to friction in the bearings and brushes, and aerodynamic drag on the rotor.That's the easy one. Calculating the BHP produced by an internal combustion engine is very complex.

The real world answer to the question is - for internal combustion engines we don't calculate BHP - we measure it. The standard method is to use a brake-band. (That's why it's called Brake horsepower.) The output shaft is fitted with a pulley. A band is placed on top of the pulley, with its two ends hanging vertically down at each side. Each end is connected to a spring balance. One balance connects directly to the test bench, the other to an adjustable tension setter. The tension is set to a suitable value; both balances now read the same number - the tension in the belt.

When the motor runs, the indicated balance readings change;their sum is still twice the tension, but the difference indicates the drag on the pulley. When the rpm of the engine is measured, the pulley diameter (d feet) x rpm x pi gives the linear speed of the pulley in feet/min. Multiplying this by the drag (lbs) and finally dividing by 33,000 gives the BHP.

Answer 3

Depends how much work you want the motor to do. Some motors in, for instance, digital cameras, work on 3 volts or less, but a motor to raise a bridge needs a 3-phase supply at high voltage.

Answer 4

One Horsepower is equal to 746 watts. Watts = amps x volts.

Answer 5

it depends on the motor but if you mean carsthe fastest car in the world a Buggatti veyron super sport it has a top speed of 267mph and 1200 hp

Answer 6

One horse power is defined as 746 watts. They are units of power. Multiplied by a period of time they define an amount of work or energy.