Colorado Esthetician Written Practice Exam 2025 - Free Esthetician Practice Questions and Study Guide

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Question: 1 / 400

Which unit measures the resistance of an electric current?

Ampere (A)

Milliampere (mA)

Ohm (O)

The correct answer is Ohm (O). Ohm is the unit that measures the resistance of an electric current. Resistance is the measure of how much a device or material reduces the electric current flowing through it. The unit Ohm is named after the German physicist Georg Simon Ohm, who discovered Ohm's Law, which relates voltage, current, and resistance in an electrical circuit.

The other options are not correct because:

- Ampere (A) is the unit of electric current. It measures how many charges pass a given point in a circuit per unit of time.

- Milliampere (mA) is a smaller unit of electric current, equal to one thousandth of an ampere.

- Volt (V) is the unit of electrical potential difference, or electromotive force. It measures the force that drives electric current through a circuit.

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Volt (V)

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