demo05 - Demonstrations for Class 5 Simple Circuits Two...

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Demonstrations for Class 5 -- Simple Circuits Two things you've got to remember about resistors in a circuit: Series and Parallel. Series Resistors : -- The current through each resistor is the same . They are all in a row, connected head-to-tail. Where's the current going to go if there are no leaks or new sources? It must ALL go into the next resistor. Just like water in a single pipe. -- Adding more resistors to a series circuit will decrease the current through each . i = V/R T If you increase R and leave the potential from the power supply the same, the current must decrease. And adding more resistors in series simply adds to the total: R T = R 1 + R 2 + R 3 +…… --- The voltage across any one resistor in the series depends on the current that flows through it and its resistance. Again: V = iR Parallel Resistors: -- The voltage across each resistor is the same . Each resistor is independently connected directly to the power supply. -- Adding more resistors does not change the current through any one resistor. They are still directly connected to the power supply, so V does not change. Adding more in parallel doesn't change V, so it doesn't change current either.

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