The correct answer is: A. average power used during the period.
A load curve is a graphical representation of the power consumed by an electrical system over a period of time. It is typically used to show the variation in power demand over a day, week, or month. The load curve can be used to identify peak demand periods, which can be used to plan for additional capacity or to implement demand-side management programs.
The load curve is typically measured in kilowatts (kW), which is a measure of power. The average power used during a period is calculated by dividing the total energy consumed by the time period.
The load curve can also be measured in kilowatt-hours (kWh), which is a measure of energy. The average kWh consumption during a period is calculated by dividing the total energy consumed by the time period and multiplying by 1000.
However, the load curve is typically used to measure power, not energy. Therefore, the correct answer is A.