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The current in a 51 resistor is 0.14 A. This resistor is in series with a 28 resistor, and the series combination is connected across a battery. What is the battery voltage?

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    R1 = 51 Ohms.
    R2 = 28 Ohms.

    Vb = V1 + V2 = I*R1 + I*R2,
    Vb = 0.14*51 + 0.14*28,
    Vb = 7.14 + 3.92 = 11.06 Volts.

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