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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?



Answer :

AL2006
Yes indeed. You're on your way. In a series circuit, the total resistance is the sum of the individuals no matter what order they're in. Now, if the question goes on to ask what is the current in the circuit, that will be the source voltage divided by the total resistance that you have calculated.

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