Physics-
General
Easy

Question

Three 60W, 120V light bulbs are connected across a 120 V power source. If resistance of each bulb does not change with current then find out total power delivered to the three bulbs.

  1. 180 W    
  2. 20 W    
  3. 40 W    
  4. 60 W    

The correct answer is: 40 W



    Here R =blank fraction numerator V to the power of 2 end exponent over denominator P end fraction Total power supplied
    equals fraction numerator V to the power of 2 end exponent over denominator fraction numerator 3 over denominator 2 R end fraction end fraction equals open parentheses fraction numerator 2 over denominator 3 end fraction close parentheses open parentheses fraction numerator V to the power of 2 end exponent over denominator R end fraction close parentheses equals fraction numerator 2 over denominator 3 end fraction cross times 60 equals 40 W

    Related Questions to study

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.