Arizona Esthetics State Board Practice Exam

Which unit is used to measure electrical power?

1. Volt

2. Watt

3. Ohm

4. Ampere

The correct answer is: Watt

The unit used to measure electrical power is the watt. Power in an electrical system is defined as the rate at which energy is converted or transferred. This can be calculated using the formula: Power (in watts) = Voltage (in volts) × Current (in amperes). Understanding this relationship is crucial for recognizing how electrical devices convert energy and how that energy is utilized. While the volt measures electric potential and the ampere measures electrical current, the watt specifically quantifies how effectively an electrical device uses that current to perform work. The ohm, on the other hand, measures resistance in an electrical circuit, which indicates how much a material opposes the flow of electric current. Therefore, watt is indeed the correct answer as it directly represents electrical power.