How to Convert Amps to Volts | Education 2022

Amps and volts are standard system units for measuring current and voltage (EMF). It is impossible to directly convert amps to volts as these are utterly different albeit “related” units of measurement. In practice, however, it is often necessary to carry out such a conversion. This usually requires additional information.

How to convert amps to volts?
How to convert amps to volts?

It is needed

  • – ammeter;
  • – ohmmeter;
  • – watt meter;
  • – calculator;
  • – technical documentation.


Step 1

To convert amps to volts:

  1. Check the device’s power rating or the conductor’s resistance. Find the devices’ power in the technical documentation or the device housing.
  2. If the documents for the device are unavailable, search for the technical parameters (power) on the Internet or measure it with a wattmeter.
  3. Use an ohmmeter to determine the resistance of the conductor.

Step 2

If the device’s power is known, use the following formula to convert amps to volts: U = P / I, where: U – voltage, in volts, P – power, in watts, I – current, in amps. The energy consumed by the electrical appliance. 

Step 3

Example: An electric motor is known to deliver 1,900 watts. The return is 50%. At the same time, I found a 10-amp fuse in the motor. Question: What voltage is the electric motor designed for? Solution. To calculate the power consumption of an electrical appliance, divide the effective power by the efficiency: 1900/0.5 = 3800 (watts). To calculate voltage, divide the power. for current: 3800/10 = 380 (volts). Answer: A voltage of 380 volts is required for the electric motor to work.

Step 4

If you know the electrical resistance of a conductor or a simple heating device (such as iron), use Ohm’s law to convert amperes to volts: U = IR, where R is the conductor’s resistance in ohms.

Step 5

Example: The coil resistance of an electric stove is 110 ohms. A current of 2 amps runs through the stove. Question: What is the voltage in the mains? Solution. U = 2 * 110 = 220 (volts). Answers. The voltage in the mains is 220 volts. 

Step 6

Example: The coil resistance of an incandescent lamp for a flashlight is 90 ohms. When it is on, a current of 0.05 amps passes through it. Q: How many standard batteries are needed to run the flashlight? Solution: U = 0.05 * 90 = 4.5 (volts). The EMF of one battery is 1.5 volts. Therefore a flashlight needs 4.5/1.5 = 3 such elements.

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