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QUESTION OF THE DAY 09/05/2015


Question of the day September 9, 2015

 Three electric lamps A, B and C are rated as follows:

Lamp A : 40 W, 220 V

Lamp B: 60 W, 220 V and

Lamp C: 100 W, 220 V




Which lamp has higher resistance? Give reason.
By

5 comments:

  1. Anonymous8 September 2015 at 06:14

    lamp A

    ReplyDelete
  2. Unknown4 October 2015 at 01:22

    Lamp A, because it has lowest power rating. And since, voltage is constant in all the 3 cases, therefore, Resistance is inversely proportional to power.

    ReplyDelete
  3. Unknown24 March 2016 at 11:35

    (A) is the answer as by using formula R=(v^2)/p we can get answer easily

    ReplyDelete
  4. Unknown21 April 2016 at 19:32

    Answer will be lamp A, since, P = V^2/ R and therefore, resistance is inversely proportional to power. We find here that the V is comstant and the only varying quantity is P . Therefore, R will be least in lamp A
    (R1 = 220/0.18 , R2 = 220/ 0.28, R3= 220/0.45)

    ReplyDelete
  5. Unknown21 April 2016 at 19:33

    Answer will be lamp A, since, P = V^2/ R and therefore, resistance is inversely proportional to power. We find here that the V is comstant and the only varying quantity is P . Therefore, R will be least in lamp A
    (R1 = 220/0.18 , R2 = 220/ 0.28, R3= 220/0.45)

    ReplyDelete

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