Effect of Adding a Third Resistor in Parallel on Series Circuit Current

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SUMMARY

When a third resistor R3 is added in parallel to resistor R2 in a series circuit with resistors R1 and R2 connected to an emf source, the equivalent resistance (Req) of R2 and R3 decreases. This reduction in resistance leads to an increase in the total current flowing through R1, as dictated by Ohm's Law (V=I*R). The discussion confirms that the current through R1 increases due to the lower equivalent resistance of the parallel combination of R2 and R3.

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Romperstomper
Resistors R1 and R2 are connected in series to an emf source that has negligible internal resistance. What happens to the current through R1 when a third resistor R3 is added in parallel to R2?

I think it will go up because the Req of R3 and R2 in parallel will be lower than R2. Since V=I*R, if R decreases, then I must increase. Is this true?
 
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Yes, that is true.
 

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