1. Circuits with more than one resistor, then Watt happens?
Series and Parallel are the 2 ways of connecting multiple resistors

2. Series Circuits
In a Series Circuit there is only one path for charges to flow so the current (I) is the same everywhere.

3. Series Circuits
The total Resistance is the sum of the 2 resistor values: Rtotal = R1 +R2
To Find the Current (I) , use I = V/Rtotal

4. Series Circuits
The battery puts in Volts (energy = skittles) and each of the resistors uses up some of the Volts. Together the 2 resistors use up the total Volts that the battery puts in.

5. Series Circuit

6. Series Circuit

7. Parallel Circuit
In a parallel circuit both resistors get the same amount of voltage as the battery puts in.

8. Parallel Circuit
Now moving charges (current) has a choice of which path to take.
The current (I) must be conserved so I1 =I2 + I3

9. Parallel Circuit
Rule for finding the total resistance in parallel: 1/Rtotal = 1/R1 + 1/R2
Use this total resistance to find the current (I) supplied by the battery

10. Parallel Circuit