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lecture15

# lecture15 - DC Cir cuits DC Cir cuits • Series and...

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Unformatted text preview: DC Cir cuits DC Cir cuits • Series and parallel rules for resistors • Kirchhoff’s circuit rules “ “ DC” Cir cuits DC” Cir cuits “ Dir ect Cur r ent 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. Alter nating cur r ent or AC is current that reverses direction many times (eg: 60 Hz current in Canada) and will not be treated 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 • Same current through all resistors • Voltages add: V eff = V 1 + V 2 + V 3 + … I R eff = I R 1 + I R 2 + I R 3 + … (same current through all) ......
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lecture15 - DC Cir cuits DC Cir cuits • Series and...

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