Series Circuits · Physics Reference Tables (2025 Edition)
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The Series Circuits box from the Reference Tables for Physical Science: Physics (2025 Edition) gives the three rules for components connected in series. It primarily supports HS-PS3-6, together with the Electricity equations and the Parallel Circuits box.
What the series circuits box shows
In a series circuit there is one path for the current, so the current is the same through every component; the potential difference of the source is shared, so the potential differences across the components add up to it; and the equivalent resistance is the sum of the resistances, so adding a resistor in series raises the total resistance and lowers the current. With V = IR these rules give the current and the potential difference across each component.
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