PhysicsHow many 176 Ω resistors in parallel are required to carry 5 A on a 220 V line?

How many 176 Ω resistors in parallel are required to carry 5 A on a 220 V line?


  1. A
    3
  2. B
    4
  3. C
    5
  4. D
    1 

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    Solution:

    We know that , potential difference , V=220and Current I=5 A
    By ohm’s Law,
    V=I×R
    220=5×R
    =2205 = 44Ω
    Hence, total resistance of the circuit is 44 ohms. Let's find how many 176 ohm resistors should be connected in parallel. Let x  be the required number of resistors.
      144 = 1176 x 
      44 x = 176 
    Hence = 17644 = 4
    Therefore, 4 resistors of 176 ohm each should be connected in parallel.
     
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