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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    Current flows through a conductor connected across a voltage source. Now the resistance of the conductor is reduced to one fourth to its initial value and connected across the same voltage source. The heating effect in the conductor will become

    A) Half                             

    B) Double 

    C)        Four times     

    D)        One fourth        

    Correct Answer: C

    Solution :

    Heating effect is the wattage of the conductor. So,       \[H=\frac{{{V}^{2}}}{R}\] If resistance is reduced to four times then \[H'=\frac{{{V}^{2}}}{(R/4)}\]or \[H'=4\left[ \frac{{{V}^{2}}}{R} \right]\] \[\therefore \]\[H'=4H\]


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