How To Find Electric Power Conversion Formulas


Power, voltage, power units, power protection, circuits, and watts conversion - these things just make your head ache. But sometimes, you don't have any other choice but to pick up the calculator, look at the conversion chart, and work on some electric power conversion formulas. Well, your nightmare isn't over yet, because one formula is not only as simple as getting factors or resolving some units. You might even need a tool more than just a calculator to do that. And yes, looking at those conversion formulas is already a painstaking thing.

Why don't you give it a chance, instead? You'll see, once you have understood the meaning of formulas, solving a conversion will be a piece of cake. So, let's start:

Watts to Amps

The watt measures the speed of energy conversion, while amps or ampere is the unit of electric current. For this conversion, this is the equation to be used:


Simply divide the watts and volts, and you can now get the amps. It's that simple.

For example: 8 watts/2 volts=4 amps

Now, let's make it the other way around-converting amps to watts

Amps to Watts

We'll just do a little tweaking of the former equation now that the unknown value is of the watts. Therefore, the equation should be:

Watts = Amps (Volts)

Just multiply the amps and the volts and the product is the watts.

Let's use the former example:

4 amps (2 volts)=8 watts

What if you need to convert watts into volts?

Watts to Volts

Again, the above equation will apply to this, only that a little change should be done so that the focus of the formula is finding the volts. Thus:


Using the above example again, the example computation will be:

8 watts/4 amps=2 volts

Here are other formulas for electric power conversion using the above equation:

volts to watts: watts=amps*volts

volts to amps: amps=watts/volts

amps to volts: volts=watts/amps

However, you should understand that this equation will only apply if the two values are known. If not, you cannot use this formula. But that does not mean you can't covert electric power. You only have to use other formulas.

Here is the formula when the units involved are amps, volt-amperes, power factor value, and volts:


This formula is used if you want to convert the VA to Amps with fixed voltage.

Yes, this is a more complicated formula but let's try it with one example:

10VA*0.2/(7volts)=Amps (?)

When solving this equation with different math operations, you simply have to solve it using this pattern: exponentiation, multiplication, division, addition, subtraction or EMDAS. But if there are parentheses or brackets, you have to first solve those equations inside these. Since the above formula does not use any equation enclosed in a bracket or parentheses, we'll use the EMDAS pattern. So:

10VA*0.2/(7 Volts) = ?

2/(7 volts) = ?

0.29 = amps

Again the same equation will apply if you will convert between the involved units. Thus:

Amps to VA with fixed voltage: VA=Amps*Volts/PF

VA to Voltage with fixed amperage: Volts=VA*PF/Amps

Voltage to VA with fixed amperage: VA=Amps*Volts/PF

Voltage to Amperage with fixed VA: Amps=VA*PF/Volts

Amperage to Voltage with fixed VA: Volts=VA*PF/Amps

Don't be overwhelmed with the intimidating formula for electric power conversion. Once you have practiced solving some problems, you will surely find it amazingly easy and fun to do the math.


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