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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    An iron box has a resistance coil of \[\text{30 }\Omega \] and takes a current of 10 A. Calculate the heat developed by it in kJ in 1 minute. 

    A) 180 kJ

    B) 90 kJ

    C) 45 kJ

    D) 135 kJ            

    Correct Answer: A

    Solution :

    \[H={{I}^{2}}\,Rt={{10}^{2}}\times 30\times 60=180000=180\,kJ\]


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