CDFA Measurement Verification Practice Exam

The correct choice indicates that an electrical meter measures an electrical quantity concerning time, typically reflecting the consumption of electricity over a specific duration. Electrical meters primarily calculate and record the total energy consumed by a home or business, often measured in kilowatt-hours (kWh). The concept of measuring energy with respect to time encompasses not only the instantaneous power but also how that power is utilized over a specified period, which is essential for understanding consumption patterns and billing purposes.

In contrast, power, voltage, and resistance are specific electrical properties. Power is the rate at which energy is used or generated at a given instant, typically expressed in watts. Voltage measures the electric potential difference between two points, while resistance quantifies how much an object opposes the flow of electric current. These properties are indeed vital for electrical systems, but an electrical meter's primary function is to measure the cumulative amount of electricity consumed over time, which relates directly to overall energy usage.