COMMERCIAL UNIT OF POWER

  • unit joule is too small and hence is inconvenient to express large quantities of energy. We use a bigger unit of energy called kilowatt hour (kW h).
  • 1kWh =1kW*1h
    = 1000W×3600s
    = 1000W×3600s
    = 3600000 J
  • 1kWh = 3.6× 106J.
  • energy used in households, industries and commercial establishments are usually expressed in kilowatt hour.
  • For example, electrical energy used during a month is expressed in terms of ‘units’. Here, 1 ‘unit’ means 1 kilowatt hour.
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