In an electric motor, the mechanical power is defined as the speed times the torque. Mechanical power is typically defined as kilowatts (kW) or horsepower (hp) with one watt equaling one joule per second or one Newton-Meter per second. Horsepower is the work done per unit of time.

## How can you tell how powerful an electric motor is?

When talking about an electrical system such as that found in an electric vehicle, the mechanical power — given in watts (W), kilowatts (kW) or horsepower (PS) — is **calculated by multiplying speed (RPM) by torque**, the rotational equivalent of linear force, measured in pound-feet (lb-ft) or Newton meters (Nm).

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

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. However, determining the power in watts for an AC source must include the power factor (PF), so **W = V x A x PF for AC systems**.

## How is electric motor horsepower measured?

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.

## How big of an electric motor is needed to power a car?

Car motors for modern vehicles range from about 50 horsepower to 500 horsepower or more. An average medium size family car might have a 150 HP motor. To duplicate that with an electric motor you would need **111,855 watts** of power. 1.

## What is the efficiency formula?

Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula **r=P/C**, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.

## How many watts is a 1 hp motor?

One electric horsepower is equal to exactly **746 watts**.

## What is the cost of 1 hp motor?

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## How many watts does a 1hp motor use?

A 1 HP motor is supposed to deliver power equivalent to **746 Watts**, or in other words, the rotational mechanical energy delivered by the shaft of the motor is rated to be equal to 746 Watts or .