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# Amps to watts calculator

15 amps to watts

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You cannot convert from amps to watts.
The Ampere is a unit of current intensity while the watt is a unit of power.
They can be related through the Joule effect law in a resistor
A resistor of resistance R that carries a current intensity I dissipates a power P=R*I^2=(R*I)*I=U*I where U is the potential difference across the resistor.
1 Watt = 1 Ohm *(1 A)^2
1 Watt = 1 Volt* 1 Ampere

Posted on Mar 26, 2014

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Posted on Jan 02, 2017

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It should tell you on the plate/sticker of the unit. If it only gives you voltage and amperage calculate it with this formula: Just substitute your values.

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The correct size of inverter is an easy calculation and important to ensure long life from the inverter and the life of the appliances getting there power from the inverter. To calculate you take the volts and multiply by the amps which equals the wattage. Every appliance has a tag which must state the volts and amps. Locate the tag to find the information. Here is an example.

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Steve,

The microwave alone shouldn't cause a problem for the generator as even the most powerful models run about 1200 watts or about 10 amps. An air conditioner on the other hand, can draw considerably more power to run depending on BTU size; 15 amps and up is not uncommon (and even twice as much as that though only briefly when starting).

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For more information about electric power in DC circuits click here. You can also use this online calculator to convert watts to HP and vice versa.

I hope I helped you, if you have more questions feel free to ask in the comments :)

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