Step 1
Look on the label of the DC motor. Write down the voltage and the wattage on a sheet of paper. For example, it may say 110 volts and 1,000 watts – or 1 kilowatt. However, if one of the numbers has a “V” before or after it instead of a word, it means volts. If the other number has a “VA,” or “W” before or after the number it means wattage.
Step 2
Enter the wattage into a calculator. Press the “Divide” button and then enter the voltage you wrote down.
Step 3
Press the “Equal” button. The result displayed is the DC motor’s amperes. Wattage divided by voltage equals amperes.