An electric bulb of 100 W is used 8 hours per day. The energy consumed by the bulb in one day is ______ units.

100 W का एक विद्युत् बल्ब प्रति दिन 8 घंटे उपयोग किया जाता है। एक दिन में बल्ब द्वारा खपत ऊर्जा ______ इकाइयां है।
  1. 800
  2. 80
  3. 8
  4. 0.80

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  1. CONCEPT:

    • Heating effect of electric current: When a current is flowing in a circuit having resistance there is heat dissipation due to the resistance. This is called the heating effect of electric current.

    The heat dissipated is given by:

    Heat (H) = I2 R t

    Work done (W) = Heat (H) = Energy consumed (E) = Power (P) × Time taken (t)

    Where I = the current flowing in the circuit, R = the resistance of the circuit, and t = the time taken

    CALCULATION:

    Given,

    Power = 100 W, Time = 8 hours per day

    We know that,

    Power (P) = Energy (E)/Time (t)

    Power = 100 W = 0.1 KW

    0.1 = E/8

    Energy (E) = 0.8 KWh = 0.8 Unit in one day

    Additional Information

    • 1 unit of electric energy: When a one-kilowatt load works for 1 hour then the energy consumed is called 1 unit of electricity.

    1 Unit of electricity = 1 KWh = 1000 Watt-hour = 3.6 × 106 J

    1 Kilo-watt = 1000 Watt

    1 Hp = 1 horsepower = 746 Watt (W)

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