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**Unformatted text preview: **Direct-Current Circuits: Source of emf source that maintains current in closed circuit; device that increases potential energy of charges circulating in circuits; work done/unit charge [EX. batteries &amp; generators] SI Units = VOLTS Equivalent Resistance In Series: EQ of a series combination of resistors is the sum of all individ resistances; always GREATER &gt; any individ resistors. Current = same in all resistors (any charge that flows through 1 flows through other) The sum of the potential differences across the resistors is equal to the total potential difference across the combination Power: (use in power dis. In resistor probs) Or (total current draw) Resistors in Parallel: Equivalent always smaller than smallest resistor in group. Total resist. = sum of inverses of individ resistors. Then FLIP ANS! Potential difference across each resistor = same (each connect directly across battery terminals) Current , I, that enters a point must = total current leaving that point I = I 1 + I 2 currents = not the same (Consequence of Conservation of Charge) [EX. HOUSEHOLD CIRCUITS WIRED IN PARALLEL; CIRCUIT BREAKERS USED IN SERIES W/ OTHER CIRCUIT ELEMENTS FOR SAFETY] Kirchhoffs Rules Junction Rule:...

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