How to Change Electrical Amps to Watts

Wattage is a measure of electrical power, such as in an electric extension cord.
••• Power Cords image by Towards Ithaca from Fotolia.com

Power is the rate at which work is performed. A watt is a measure of electromechanical power defined as one ampere, or amp, of current flowing through a circuit with an electrical difference of one volt. An amp is a measure of current equal to 1 coulomb of charge passing through a point in the circuit each second. The calculation of a circuit's wattage requires you to know the amperage and voltage of the circuit.

    Determine the voltage of the circuit. Assume for this example the circuit has 110 volts, the standard house voltage in the United States.

    Determine the amperage in the circuit. Assume for this example the circuit has a light bulb drawing about 0.91 amps.

    Multiply the number of amps by the number of volts to obtain the number of watts in the circuit. The equation W = A x V shows this relationship where W is the wattage, A is the amperage and V is the voltage. This example assumes a voltage of 110 volts and an amperage of 0.91 amps. The light bulb therefore uses 110 x 0.91 = 100 watts.

Related Articles

How to Convert KWH to KVA
How to Regulate DC Power With Resistors
How to Convert Candle Power to Lumens
How to Convert 12 Volt Alternator to 120 Volts
How to Design an RC Snubber
Energizer Watt-Hour Battery Specs
How to Calculate Millivolts to Amps
How to Calculate Instantaneous Voltage
How to Convert Ohms to Kilowatts
How to Convert mW to mA
How to Use a 9-Volt Battery to Power LEDs
How to Measure Electric Motor Torque
How to Calculate Kva to Amp
How is Wattage Calculated?
How to Calculate Ohms
How to Calculate IRMS
How to Calculate KVA to MVA
How to Use a Multimeter for the Beginner