5. 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 ohm. If each resistor is operating in the circuit at its maximum power dissipation, total current flow is
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A. 190 mA
B. 27 mA
C. 2.7 mA
D. 19 mA