ARRL Technician Practice Exam 2025 – Complete Prep Guide

Question: 1 / 470

Electrical power is measured in which of the following units?

Volts

Amperes

Watts

Electrical power is measured in watts, which quantifies the rate at which electrical energy is transferred or converted. One watt is defined as one joule per second, indicating how much energy is being used or produced in a circuit over a specified period.

In the context of electrical circuits, power can be calculated using the formula:

Power (P) = Voltage (V) × Current (I)

Where voltage is measured in volts and current in amperes. This relationship highlights that while volts and amperes are essential measurements in electricity, they do not directly measure power. Instead, they are the components that, when multiplied, produce the power measurement in watts.

Ohms, on the other hand, measure electrical resistance, not power. Therefore, in this question, watts are the correct unit to denote electrical power.

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