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Physics, 22.09.2019 19:10 mat1413

In the series circuit below the power source is a 9-volt battery and three resistors are r1 = 7 ohm, r2 = 9 ohm and r3 = 2 ohm. what is the total resistance in the series circuit?
r1 7 ohm + r2 9 ohm + r3 2 ohm = 18
is this correct?

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