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Umangi Grover
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Asked: 2020-10-20T11:54:43+00:00 In:

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

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NCERT Solution for Class 10 Science Chapter 12
Electricity
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-222
Questions No-15

2020-2021cbsechapter 12class10electricityncertscience
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    2 Answers

    1. For the lamp one: Power P1 = 100 W and Potential Difference V = 220 V
      Therefore,
      ๐ผ1=๐‘ƒ1/๐‘‰=100220=0.455 ๐ด
      For the lamp two: Power P2 = 60 W and Potential Difference V = 220 V
      Therefore,
      ๐ผ2=๐‘ƒ2/๐‘‰=60/220=0.273 ๐ด
      So, the net current drawn from the supply is given by
      ๐ผ=๐ผ1+๐ผ2=0.455+0.273=0.728 ๐ด

      For more answers visit to website:
      https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-12/

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    2. Power of first lamp (P1) = 100 W
      Potential difference (V) = 220 V

      I=P/V= 100/220A= 0.455A

      Resistance of lamp 1= V/I= 220/(100/220)= 484ohm.

      Therefore,
      ๐ผ2=๐‘ƒ2/๐‘‰=60/220A=0.273A

      So, the net current drawn from the supply is given by
      ๐ผ=๐ผ1+๐ผ2=0.455+0.273=0.728 ๐ด

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