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03_28_Circuits_3

# 03_28_Circuits_3 - Today 3/28 o Circuits i Current i...

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Today 3/28 o Circuits i Current i Potential (same as always) i Capacitance (energy and in circuits) i HW: 3/28 “Circuits 3” Due Wednesday 4/2 i Note: Watch out for “round off” errors, keep three decimal places to the end on all circuit homeworks.

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Voltage Model o Voltage: how much energy each coulomb of charge gains (battery) or loses (bulb) in going through an element. (as usual) o More glow, more voltage. o The Loop Rule: o What goes up, must come down! V A,A = 0, voltage rises and drops must must cancel around any loop.
Current Model Fails A B Compare B to D B gets all of the current through A. D gets half of the current through C. But the current through C is bigger than the current through A. C E D Can’t be sure which is brighter!!! less current more current all 1 / 2 1 / 2

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Voltage Model A B Compare B to D C E D C brighter than D C has more voltage than D V V Compare the voltages across B and D. More volts more glow! Recall current for B and D. V V think loops V V
Voltage Model The voltage for series elements SPLITS because it adds up to the battery voltage. The voltage splits equally for identical Rs. Otherwise, the voltage drop is greater across the greater R. A B in series

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Find Equivalent Resistance 12 V ? R eq = 6 2 6 8 8 9 7 5 12 V 4 6 3 12 12
Find current through the battery 2 6 8 8 9 7 5 12 V 6 I = 2 Amps 12 V It is the same as the current through R eq . R eq = 6

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Current through each element 2 6 8 8 9 7 5 12 V 6 I = 2 Amps What is the current through each resistor?
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03_28_Circuits_3 - Today 3/28 o Circuits i Current i...

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