The watt is a unit of power named after the Scottish engineer James Watt. It measures the rate of power conversion and can be calculated by the product of volts and amps: watts = volts x amps. A milliwatt is 1/1000 of a watt, and a millivolt is 1/1000 of a volt. To convert milliwatts to millivolts, you have to know the amps involved in the circuit. An amp is a measure of the amount of electrical charge being passed through a circuit.

- Skill level:
- Moderate

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## Instructions

- 1
Determine the value of amps in a circuit. Assume that a small electronic device can pull 75 milliamps of current. Write the number down.

- 2
Determine the value of wattage in the circuit. For example, there are 200 milliwatts available for the electronic device. Write the number down.

- 3
Calculate the millivolt value using the following formula: millivolts = milliamps / milliwatts. For this example, the answer is 75 milliamps / 200 milliwatts, or 0.375 millivolts.