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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    You have the following appliances each of 500 watts, running on 220 volts A.C (i) electric iron (ii) an electric lamp (iii) an electric room heater The electrical resistance is:

    A)  maximum for the room heater        

    B)  maximum for the electric lamp

    C)  maximum for electric iron

    D)  same in all the three cases  

    Correct Answer: D

    Solution :

                    \[P=\frac{{{V}^{2}}}{R}\] Since, rated power and rated voltage of each a same, \[R\] for each is also same.


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