Simple Amperage Calculations: Watts, Volts, & Ohm's Law (with an Ammeter)

Thứ bảy - 27/04/2024 01:09
Simple tools and formulas to calculate amperage An ampere, shortened frequently to amp, is a unit of measure that is used for electrical current. Current is the measure of electrons that flow through a given circuit. This information can...
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An ampere, shortened frequently to amp, is a unit of measure that is used for electrical current. Current is the measure of electrons that flow through a given circuit.[1] This information can be very useful in the event you are trying to connect a tool or appliance to the mains, which is the term used to describe the AC current that flows directly from an electric company's generating station to your household.[2] [3]

This article is based on an interview with our licensed electrician, Mantas Silvanavicius, owner of M+S Electric. Check out the full interview here.

How to Calculate Amps

  • The formula to calculate amps is I(A) = P(W) / V(V). Amps are equal to Watts divided by Voltage.
  • You can use an ammeter to measure amps or milliamps.
  • Use Ohm's Law to divide the total voltage by each resistor's resistance in Ohms.
Method 1
Method 1 of 3:

Convert Watts to Amps

  1. Step 1 Apply the conversion formula for DC electricity.
    Electric current, represented by I, which is measured in amps (A), can be found by dividing power in watts (W) by the volts (V) or voltage. This is represented by the following formula:
    • I(A) = P(W) / V(V)[4]
      Or, more simply: Amps = Watts / Volts
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Method 2
Method 2 of 3:

Measure Amperage with an Ammeter

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Method 3
Method 3 of 3:

Calculate Amperage with Ohm's Law

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Warnings

  • Whenever dealing with electricity, you should exercise caution. You could be shocked, or when working with high voltage, start an electrical fire. It is recommended that you wear insulated gloves.
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