Watts to Amps

Welcome to watts to amps, our site about the conversion from the power in watts to the current in amperes. The electric power P is the work done per unit of time, measured in the unit watt (W). The electric current I is the flow of an electric charge, measured in the unit ampere (A). Take note of the equation I = P / V, V for the voltage (electric potential) in volts, and read on to learn everything about watts to amperes.



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Convert Watts to Amps

From the equation I(A) = P(W) / V(V) follows that in order to determine the current I, in addition to P, the voltage V must be known. Use the following formulas:

  • DC: I(A) = P(W) / V(V)
  • AC, Single Phase: I(A) = P(W) / (PF × V(V))
  • AC, Three Phase, Line to Line Voltage: I(A) = P(W) / (√3 × PF × VL-L(V))
  • AC, Three Phase, Line to Neutral Voltage: I(A) = P(W) / (3 × PF × VL-0(V))

The power factor PF is defined as the real power drawn in W divided by the supplied power measured in volt-amperes (VA). The trigonometric significance can be found below.

Note that DC stands for direct current, and that AC means alternating current; AC is the form in which electric power is usually delivered to retail customers.

In turn, a computer internally works on DC. Besides power supplies, for instance, batteries produce an unidirectional flow of electric charge. Usually, an inverter changes DC to AC.

Let’s look at how to change watts to amps by means of an example:

What is the current in amperes (often shortened to amps) if the power consumption is 60 W and the voltage supply is 220 V, PF=0.7?

  • DC: I(A) = 60 W / 220 V = 0.27 A
  • AC, Single Phase: I(A) = 60 W / (0.7 × 220 V) = 0.39 A
  • AC, Three Phase, Line to Line Voltage: I(A) = 60 W / (√3 × 0.7 × 220 V) = 0.22 A
  • AC, Three Phase, Line to Neutral Voltage: I(A) = 60 W / (3 × 0.7 × 220 V) = 0.13 A

When it comes to watts to amperes, instead of using pen and pencil, or applying the formula manually with a calculator, it is recommended employing our converter.

About our Calculator

Using our app at the beginning of this page is straightforward: Insert the power in watts, then fill in the voltage. If you have a direct current, then you already have the result.

In case of AC, you must choose the number of phases and the power factor (PF). If you have an alternating current system with 3 phases, then the voltage type is required.

In your home, you have your appliances plugged into an AC single phase system.

Only for an alternating current with three phases, the line to neutral RMS (root-mean-square) or the line to line coefficient must be factored in, too.

The PF is commonly defined as cosine (phase angle between voltage and current), and thus has a value in between 0 and 1. Real power is also known as true power or active power.

Here you can find all information about amps to watts, including a calculator and the formulas. Keep reading to learn everything about the watt to amp conversion.

Watts to Amps Conversion

Reading our article till here, you already know how to conduct a watts to amps conversion using our calculator or the formula which corresponds to your electric system.

If you would like to learn more about André-Marie Ampère and James Watt, the inventors of the units under consideration, then check out the sites listed in the reference section.

Our frequent conversions in this category include, for example:

In the concluding paragraph ahead, you can find the summary of watts to amperes, along with an alternative for looking frequent power to current conversions up.

Watts to Amperes

You have made it to the concluding section of our watts to amperes article, which we summarize using this image:

The bottom line of watt to amps is that both, the watts as well as the volts, must be known.

In the absence of either, the electric potential or the electric power, the current in amperes cannot be calculated as there is no direct watt to amp relationship.

You may use the search form in the sidebar of our website to locate frequent conversions. There, insert, for example, x watts into amps, assuming x denotes your power.

To convert kilowatts to amps read this article.

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– Article written by Mark, last updated on December 5th, 2023