Which unit does a meter clearly register to measure energy usage over time?

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Multiple Choice

Which unit does a meter clearly register to measure energy usage over time?

Energy usage over time is about how much energy has been consumed, not the instant rate. A meter tracks the total energy drawn, which is the accumulation of power over time. Power is measured in watts or kilowatts (instantaneous rate), but energy accumulated over a period is measured in kilowatt-hours. One kilowatt-hour equals using 1 kilowatt of power for one hour (1000 watt-hours). Since meters report the total amount of energy used, the appropriate unit is kilowatt-hours. Watt-hours are also energy, but on a smaller scale, and watts measure only instantaneous power, not total usage over time.

Energy usage over time is about how much energy has been consumed, not the instant rate. A meter tracks the total energy drawn, which is the accumulation of power over time. Power is measured in watts or kilowatts (instantaneous rate), but energy accumulated over a period is measured in kilowatt-hours. One kilowatt-hour equals using 1 kilowatt of power for one hour (1000 watt-hours). Since meters report the total amount of energy used, the appropriate unit is kilowatt-hours. Watt-hours are also energy, but on a smaller scale, and watts measure only instantaneous power, not total usage over time.

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