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  1. A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 . If each resistor is operating in the circuit at its maximum power dissipation, total current flow is

    2. A.
    27 mA
    B.
    2.7 mA
    C.
    19 mA
    D.
    190 mA

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    Answer : Option A

    Explanation :

    Total P = P1 + P2 + P3 = 7/8w.

    P = I2R.

    I = sqrt (P/R)

    Now, P = 7/8w, R = 1200 ohm.

    Therefore,

    I= sqrt ( (7/8)/1200 ) = 0.0270030862 = 27 mA.

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