Physics-
General
Easy

Question

The current in the given circuit is

  1. 8.31 A    
  2. 6.82 A    
  3. 4.92 A    
  4. 2 A    

The correct answer is: 2 A


    6W and 6W are in series, so effective resistance is 12W which is in parallel with 3W, so
    fraction numerator 1 over denominator R end fraction equals fraction numerator 1 over denominator 3 end fraction plus fraction numerator 1 over denominator 12 end fraction equals fraction numerator 15 over denominator 36 end fraction Þ R equals fraction numerator 36 over denominator 15 end fraction
    \ I equals fraction numerator V over denominator R end fraction equals fraction numerator 4.8 cross times 15 over denominator 36 end fraction equals 2 A

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