What is the other name of the commercial unit of electrical energy?

  • A
    Kilowatt-hour $(kWh)$
  • B
    Joule $(J)$
  • C
    Watt $(W)$
  • D
    Ampere $(A)$

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$(b)$ Name the characteristics which make it suitable for this.

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What is the practical unit used for electrical energy?

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