# How is motor wattage calculated?

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In a motor, power is delivered to the load by converting electrical energy per the following laws of science. … 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 is motor horsepower calculated?

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 do you calculate the power consumption of a single phase motor?

Single-Phase Calculations

Basic electrical theory tells us that for a single-phase system, kW = (V × I × PF) ÷ 1,000. kW = (V × I) ÷ 1,000.

## How do I know how many watts my amp is putting out?

Anyway, the standardized test is to measure the voltage across a 8 Ohm power resistor at 1% distortion and then calculate the power from P=V^2/R. This is what the wattage rating of an amp means.

## How many amps is 3 horsepower?

Common Horsepower to Amps Conversions

Horsepower Amps Efficiency
3 HP 20.7 A 90%
3.5 HP 24.2 A 90%
4 HP 27.6 A 90%
4.5 HP 31.1 A 90%
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## How many horsepower is a 10 amp motor?

Common Amps to Horsepower Conversions

Amps Horsepower Efficiency
10 A 1.45 HP 90%
15 A 2.17 HP 90%
20 A 2.9 HP 90%
25 A 3.62 HP 90%

## How many kW is 1kva?

kVA to kW Conversion Chart

kVA kW
1,000 kVA 800 kW
1,125 kVA 900 kW
1,250 kVA 1,000 kW
1,563 kVA 1,250 kW

## How many watts does a 25 hp motor use?

Re: Cost to operate a 25 HP Motor…

25 hp = 18,642.5 Watts according to my calculator. 18.6 KW * \$. 08 = \$1.488 per hour. At 18.6KW / 220V the motor draws 84.5 amps.