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  1. The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

    2. A.

     8.5 A
    B.

     24 A
    C.

     10 A
    D.

     12 A

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    Answer : Option A

    Explanation :

    V = 60V and I = 4A
    R = V/I
    ​= 60/4
    ​=15Ω
    When potential difference is increased to 127.5 V
    I = V/R
    ​= 127.5/15
    ​= 8.5 A
    The current through the heater becomes 8.5 A.

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