Today’s agenda
Today's agenda:
Resistors in Series and Parallel.
You must be able to calculate currents and voltages in circuit components in series and in parallel.
Kirchoff's Rules.
You must be able to use Kirchoff's Rules to calculate currents and voltages in circuit components that are not simply in series or in parallel.
Resistances in Circuits
Recall from lecture 7: ? two simple ways to connect circuit elements
Series: A
B
Parallel:
A
B
Circuit elements can be connected neither in series nor in parallel.
Identifying series and parallel connections
A
B
If you can move your finger along the wires from A to B without passing a junction, i.e., without ever having a choice of which wire to follow, the components are connected in series.
In contrast:
A ???
B
If you ever have a choice of which wire to follow when moving from A to B, the circuit elements are not in series. If each element provides an alternative path between the same points A and B, the elements are in parallel.
Circuit elements can be connected neither in series nor in parallel.
Are these resistors in series or parallel?
+ -
V
parallel
Not enough information: It matters where you put the source of emf.
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