# How do you calculate the horsepower of an electric motor?

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The quickest method to closely estimate motor horsepower is to use a digital clamp meter to measure current and voltage to the motor, and then perform a simple calculation. Use this formula to estimate motor horsepower. Horsepower(hp)= Voltage x Amperage x % EFF x power factor x 1.73/746.

## What is the horsepower of an electric motor?

Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor’s efficiency tends to decrease dramatically below about 50% load.

## How do you calculate horsepower example?

Horsepower Formula

1. Horsepower (HP) = (Torque × Speed)/5252. …
2. Example 1.
3. Determine the horsepower of a car which moves with a speed of 600 revolutions per minute and has a torque of 100 pound-foot.
4. Solution: …
5. HP = 1.142 hp. …
6. Speed = (Horsepower × 5252)/ Torque. …
7. Speed = 18.17 revolutions per min.

## How many hp is 4.5 amps?

Common Horsepower to Amps Conversions

Horsepower Amps Voltage
3.5 HP 24.2 A 120 V
4 HP 27.6 A 120 V
4.5 HP 31.1 A 120 V
5 HP 34.5 A 120 V

## Is electric HP the same as gas HP?

Unlike a gasoline engine, electric vehicles (EVs) deliver power a little differently. … The main difference is immediate power and torque. A car company may say that one of their gasoline-powered engines has 300 horsepower, but that’s actually peak horsepower.

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## What is horsepower example?

A unit that is used to measure the power of engines and motors. One unit of horsepower is equal to the power needed to lift 550 pounds one foot in one second. … An example of horsepower is the measurement of the pulling ability of a building crane. An example of horsepower is the measurement of the power of a motor.

## What is wattage formula?

The formula for calculating wattage is: W (joules per second) = V (joules per coulomb) x A (coulombs per second) where W is watts, V is volts, and A is amperes of current.

## How many amps is a 3/4 HP motor?

AMP DRAW BASED ON HORSEPOWER

HP 1 Phase Amps 3 Phase Amps
115 volt 208 volt
3/4 13.8 3.5
1 16 4.6
1-1/2 20 6.6

## How many amps is a 1hp motor?

Watts = Watts ÷ Efficiency. Amps = Watts ÷ Volts. Amps = (HP × 746) ÷ Efficiency ÷ V.

How many amps does a hp motor draw?

Horsepower Amps Voltage
1 HP 6.91 A 120 V
1.25 HP 8.63 A 120 V
1.5 HP 10.4 A 120 V 