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Series and parallel combined

Change any part of a circuit and the current changes everywhere

When you have a parallel part of a circuit in series with another part of a circuit you need to be really careful not to fall victim to the constant current misconception.

Try Why Do Astronauts Float by Julian Hamm

When you change one of the resistances in the parallel part you're changing the effective resistance of that whole part.  This means the effective resistance of the whole circuit changes and so will the current drawn from the battery.

If the resistance of the parallel part changes then the voltage is shared differently between the parallel part and the series part.

The voltage across all the parallel arms is still the same but it won't be the same as it was before it was changed.

back to Lesson 9: Series Circuits