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06/18/18 How Do I Convert Watts to Amps? (with Volts)

Article - June 18, 2018 By

15KVA Power Substation - 600V to 208Y/120V 3PH - (1) ADR3033 (10) 5-20R GFCI Duplex - 20' Cable

How Do I Convert Watts to Amps? (with Volts)

Measuring electrical flow and power consumption can be tricky, but we’re here to shine some light on the process.

Why Convert Watts to Amps? (Overview)

Converting watts to amps (or vice versa) is a straightforward process. This type of conversion is useful for balancing various parts of a machine or device, system sizing and measuring electrical flow.

Before diving into the equation, it is important to first understand the values in the formula, as they measure different things:

• Power = Watts

• Current = Amps (coulomb of charge per second)

• Voltage = Volts

Converting Watts to Amps with Volts

Because watts and amps measure different things, one must include (fixed) voltage in the formula. This allows you to calculate a missing unit, which can be any of the three (watts, amps or volts) depending on the provided information.

Formula: Watts / Volts = Amps


Find Amps for a 40-watt bulb on a 120V supply.

40W / 120V = 0.33A

Converting Amps to Watts with Volts

In some cases, you have to make the most out of the information you are provided with. To convert amps to watts, simply update the formula:

Formula: Amps x Volts = Watts


Find Watts for a unit operating at 2 Amps on 120V.

2A x 120V = 240W

To summarize, at least two values are needed to convert watts to amps or vice versa. Using a fixed voltage value, one can directly compute for watts or amps depending on the secondary value provided.

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