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# lecture15 - DC Circuits DC es l s sistors S rie and paralle...

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DC Circuits DC Circuits Series and parallel rules for resistors Kirchhoff’s circuit rules

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DC” Circuits DC” Circuits Direct Current or DC ”: current always flows in one direction. For circuits containing only resistors and emf’s the current is always constant in time. Circuits containing other elements such as capacitors and inductors as well as resistors will have currents that change with time. Alternating current or AC is current that reverses direction many times (eg: 60 Hz current in Canada) and will not betreated in this course
Resistors in Series Resistors in Series R 1 R 2 R 3 I 1 1 V IR = 2 2 V IR = 3 3 V IR = A B We want to replace this combination by a single resistor with resistance R eff A B R eff I

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Samecurrent through all resistors Voltages add: V eff = V 1 + V 2 + V 3 + … IR eff = IR 1 + IR 2 + IR 3 + … (samecurrent through all) ... 3 2 1 + + + = R R R R eff So, Easy way to remember: think of thelength of a string:
Resistors in Parallel Resistors in Parallel R 1 R 2 R 3 I I 1

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