What does a wattmeter measure?

A wattmeter measures the power consumption in watts, which is the product of voltage and current when considering the phase angle in alternating current (AC) circuits. This device is specifically designed to quantify the amount of electrical energy used over time, which is essential for understanding energy consumption in various applications.

The measurement is crucial for various scenarios, including residential energy use assessments, industrial applications, and energy efficiency calculations. By providing a clear reading of power in watts, the wattmeter helps electricians, engineers, and consumers gauge how much energy an electrical device is consuming at any given moment. This not only aids in determining cost but also in assessing the operational efficiency of electrical systems.