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12 January, 09:05

The current in the wires of a circuit is 120.0 milliamps. If the voltage impressed across the ends of the circuit where tripled (with no change in its resistance), then its new current would be how amps

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  1. 12 January, 09:20
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    Current in a wire is 120mA

    I = 120mA = 120 * 10^-3 A

    I = 0.12 A

    If the voltage applied at across the wire is tripled

    From ohms law

    V=IR

    R = V / I

    Since R is constant

    Then,

    V / I = K

    Then, we can say

    V / I = V' / I'

    Given that,

    Initially

    V = V and I = 120mA

    Then, V' = 3V and I' = ?

    So,

    V / I = V' / I'

    V / 120 = 3V / I'

    Cross multiply

    V * I' = 120 * 3V

    Divide both sides by V

    I' = 120 * 3V / V

    I' = 360mA

    So, the current in the wire when the voltage was tripled is 360mA, the current was also tripled
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