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In a series circuit the current Is 15A. The current drops to 12 A when 8 W resistor Is added to the circuit In series.

In a series circuit the current Is 15A. The current drops to 12 A when 8 W resistor Is added to the circuit In series. a) Find the resistance of the original circuit. b) What additional resistance Is needed to drop the current to 10 A (use the result obtained In part a).

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