Physics-
General
Easy

Question

Five bulbs B1 , B2 , B3 and B4 each of rating 60W / 200V and B5 of rating 120W /400V are connected as shown in circuit. Total power consumption by all the bulbs is :

  1. 240 W    
  2. 270 W    
  3. 90 W    
  4. 180W    

The correct answer is: 180W


    P subscript B subscript 1 end subscript plus B subscript 2 end subscript end subscript equals 30 W
    P subscript B subscript 3 end subscript end subscript equals 60 W comma P subscript B subscript 4 end subscript end subscript equals 60 W
    P subscript B subscript 5 end subscript end subscript equals fraction numerator left parenthesis 200 right parenthesis to the power of 2 end exponent over denominator fraction numerator 400 to the power of 2 end exponent over denominator 120 end fraction end fraction equals fraction numerator 120 over denominator 4 end fraction equals 30 W
    P subscript text total  end text end subscript equals 180 W

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