How to Convert Watts to Volts

How to Convert Watts to Volts
••• FactoryTh/iStock/GettyImages

Being able to quickly and accurately convert watts into volts is essential for a range of engineering disciplines. Amps, volts, and watts are part of a triad where when two quantities are known the third can be calculated, using the following formula:

1\text{ watt}= 1\text{ volt}\times 1\text{ ampere}

By using a clamp-on ammeter for AC (alternating current) circuits or an inline (series) ammeter for DC (direct current) circuits, you can measure current and use the value of power to convert watts to volts. Follow these steps to find the voltage.

    Place the AC ammeter around one of the power wires in an AC circuit. This can be either the hot wire or the neutral common wire in the circuit. Both of these wires will carry the current or amperage for the electrical circuit.

    Convert the wattage of 1000 watts into volts for a circuit that has an amperage of 10 amperes. Using the power equation and solving for volts, you end up with:

    1\text{ volt}=\frac{1\text{ watt}}{1\text{ ampere}}

    Divide 1000 watts by 10 amperes and the resultant voltage would equal 100 volts.

    Install the inline ammeter into the DC circuit by placing the meter in series with one of the electrical circuit wires. Again this meter can be placed on either the positive (+) wire or the negative (-) wire of the direct current circuit. All power though must pass through the inline series ammeter.

    Find the voltage in the direct current circuit of 480 watts with an amperage reading of 15 amperes. Using the translated formula:

    \text{ volts}=\frac{\text{watts}}{\text{amperes}}=\frac{480\text{ watts}}{15\text{ amperes}}=32\text{ volts}

    Things You'll Need

    • AC clamp-on ammeter
    • DC inline (series) ammeter


    • Generally, the nameplate of most devices would list all of the above ratings in watts, volts and amperes. Smaller electrical circuits, though, may not list any specifications, and test equipment would be used to find the needed values.

Related Articles

How to Regulate DC Power With Resistors
DIY Very Simple 60-Hertz Oscillator With a Quartz Circuit
How to Use a Resistor for 12 Volt to 5 Volt
How to Calculate Millivolts to Amps
How to Wire a Battery in Series
How to Calculate 30 KW to Amps
How to Calculate Load Current
How to Convert 12 Volt to 6 Volt
How to Measure Wattage With a Multimeter
How to Read Amps on an Analog Multimeter
How to Use a Multimeter for the Beginner
How to Change Electrical Amps to Watts
How to Use a Variac
How to Convert 12 Volt Alternator to 120 Volts
How to Turn a 12-volt DC Into a 5- or 6-volt DC
How Does a DC Power Supply Work?
How to Calculate DC Voltage
How to Make an Electrical Circuit with Paper Clips
How to Find Resistance With Power & Voltage
How to Build DC to AC Power Inverters