Wednesday 15 May 2013

An electric lamp of 100 Ω a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω



Question 2:
An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?
Solution:
Resistance of electric lamp (R1) = 100 Ω
Resistance of toaster (R2) = 50 Ω
Resistance of water filter (R3) = 500 Ω
Potential difference of the source, V = 220 V
Since all the resistance are in parallel then the equivalent resistance R of the circuit will be 
 

All the three given appliances are drawing 7.04 A of current.
Therefore, current drawn by an electric iron connected to the same source of potential 220 V = 7.04 A
Let   Rʹ be the resistance of the electric iron. According to Ohm’s law,
 
 






Therefore, the resistance of the electric iron is 31.25 Ω and the current flowing through it is 7.04 A.

 

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21 comments:

  1. Anonymous26 April 2017 at 07:58

    Wow really helpful

    ReplyDelete
  2. Unknown14 May 2017 at 07:29

    Nice one

    ReplyDelete
  3. Unknown28 July 2017 at 08:46

    Wish I had this website during my 10th.

    ReplyDelete
  4. Unknown26 November 2017 at 05:55

    Hi,he mentioned electric iron also connected.then how can u take only R1,R2,R3 and calculate total resistance of a ckt

    ReplyDelete
  5. Rakesh13 May 2018 at 23:18

    Thanks

    ReplyDelete
  6. Unknown25 May 2018 at 07:45

    thanks

    ReplyDelete
  7. Unknown11 July 2018 at 06:58

    Really this helped me a lot..
    Thanks a lot

    ReplyDelete
  8. sachin22 August 2018 at 00:14

    It helps me to understand. I am sure that it helps to everyone.

    ReplyDelete
  9. Unknown23 August 2018 at 08:16

    Why we reciprocal the 16 by 500 and again reciprocal it to 500 bye 16

    ReplyDelete
    Replies
    1. Unknown21 November 2018 at 16:40

      Because it is connected in parallel. That is y

      Delete
    2. Unknown21 November 2018 at 16:42

      Because it is connected in parallel. That is y

      Delete
  10. Unknown1 October 2018 at 08:54

    Thanks answer is correct


    ReplyDelete
  11. Unknown1 October 2018 at 08:55

    Thanks answer is correct


    ReplyDelete
  12. Unknown2 December 2018 at 07:08

    7.04 is the total current ain't It?? So all three appliances are taking it collectively???

    ReplyDelete
  13. Unknown20 May 2019 at 23:42

    Thoda aur zyada simple tarika batao

    ReplyDelete
  14. Ayush kumar7 December 2019 at 04:25

    thanks for this

    ReplyDelete
  15. Unknown5 June 2020 at 22:10

    Good

    ReplyDelete

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