# How do you calculate the power rating of a motor?

Contents

By taking the voltage and multiplying it by the associated current, the power can be determined. A watt (W) is a unit of power defined as one Joule per second. For a DC source the calculation is simply the voltage times the current: W = V x A.

## How do you determine the power rating of a motor?

Multiply the motor voltage by the full-load current. The result is in watts. Divide watts by 1,000 to give kilowatts. For example, 230 volts x 20 amps = 4,600 watts; 4,600 watts divided by 1000 = 4.6 kilowatts.

## What is the formula for power rating?

What is the maximum power rating in watts of a fixed resistor which has a voltage of 12 volts across its terminals and a current of 50 milliamperes flowing through it. Given that we know the values of the voltage and current above, we can substitute these values into the following equation: P = V*I.

## What is the rated power of a motor?

Electrical motors are rated in horsepower or watt

IT IS INTERESTING:  Best answer: How is energy conserved in an electric motor Class 10?

The old imperial unit horsepower is equal to 746 watts (0.745 kW) or 33000 lb ft per minute (or 550 lb ft per second). The unit of electric power – 1 watt – is equal to the power produced by an electrical current of 1 amp at a potential difference of 1 volt.

## How do you calculate kwh of a motor?

For example, if the electric motor uses 50 amps at 240 volts, the wattage is 50 x 240 x 1.73, or 20,760 watts. Electricity costs are based on kilowatts (kW), so divide watts by 1000 to convert to kilowatts (20,760 wats/1000 = 20.76 kW).

## How many kW is a 10 hp motor?

Horsepower (metric) to Kilowatt Conversion Table

Horsepower (metric) Kilowatt [kW]
2 horsepower (metric) 1.4709975 kW
3 horsepower (metric) 2.20649625 kW
5 horsepower (metric) 3.67749375 kW
10 horsepower (metric) 7.3549875 kW

## How many kW is 3phase?

For 3-phase systems, we use the following equation: kW = (V × I × PF × 1.732) ÷ 1,000. Again, assuming unity PF and solving this equation for “I,” you get: I = 1,000kW ÷ 1.732V.

## What is work formula?

Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.

## What is rated output power?

rated output power: That power available at a specified output of a device under specified conditions of operation. (188) Note: Rated output power may be further described; e.g., maximum rated output power, average rated output power.

IT IS INTERESTING:  Question: How is BLDC motor current measured?

## What is short time rating of motor?

A short time rating of an electric motor can be defined as the extrapolated overload rating of the motor which it can supply for the specified short time without getting overheated. Now a days the machines are being designed and manufactured for short duration having sufficient overload torque capability.

## How many watts is a 1 hp motor?

One electric horsepower is equal to exactly 746 watts.

## What is kW rating of motor?

Three Phase Motors

MOTOR RATING HP APPROX. F.L.C. AT LINE VOLTAGE
0.56 kW 3/4 3.1
0.75 kW 1 3.5
1.1 kW 1.5 5
1.5 kW 2 6.4

## How much electricity does a 100 hp motor use?

Expect actual operating costs to vary. For example, a 460-volt, three-phase, standard efficiency 100 HP motor operating under full load for 8,760 hours per year will probably cost just over \$48,000 per year to operate at an electric rate of \$0.10 per kWh.

## How much electricity does a 30 hp motor use?

Designed power capacity of a motor 30 HP,at 415 V, 3 phase power factor 0.8 (assumed). Full load current is , one HP is 745 w, 30 HP is 30 x 745 =23.35 kW, W = V x I x pf, 23.35 = 415 x I x 0.8, I = 23.35 divided by 415 x 0.8 = 67 amps.

## How much power does a 2 hp motor use?

How many watts does a 2 HP motors have? If a 2 horse power motor is doing 2 horsepower of work then in the load about 1500 Watts of energy is used in the load.