1. Rated power: refers to the maximum power that the device or electrical appliance can continue to work, which is usually marked on the name card or instruction manual of the device or electrical appliance.

    2. Active power and reactive power: Active power refers to the power that the load actually consumes when it is working, and reactive power refers to the useless power generated by the load when it is working.

    3. Power factor: refers to the ratio of useful power to apparent power, which is one of the indicators for evaluating circuit energy efficiency.

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