2. Electrons in Circuits

3. Parts of a circuit Battery Closed switch (allows electrons to flow)
Open switch (impedes flow)
Wire
Resistor
Light Bulb

4. Circuit
Complete path from a positive to negative terminal of a battery
Electrons flow from the negative to positive end

5. Source of Electrons in a Circuit
Source of electrons does not come from a power outlet but from the conducting circuit material (wires)
Energy flows from outlets to the circuit causing electrons to move

6. Types of circuits
Depend on how more than one device receive electrical energy
Series
Single pathway of electron flow
Parallel
Branched pathway, each of which is separate path for the flow of electrons

7. Series Circuits
If one device fails, it causes an open circuit where no current can flow
Resistance increases, the more devices connected to the circuit
Same current passes through each device in the circuit
Circuits used in Christmas tree lights.

8. Parallel Circuits
Overall resistance decreases the more devices connected to the circuit (alternative paths for electrons to travel)
Same voltage passes through each device, all connected to the same battery
One device fails, rest of circuit still works
Circuit type used in houses