1. Electrical Circuits

2. A closed pathway that allows transfer of electrical energy.
1. What is a circuit?
A closed pathway that allows transfer of electrical energy.

3. 2. Basic Parts of Circuit

4. Basic parts of a circuit:
Load (Receiver) (light bulb)
Wires
Power Source (battery)
Switch

5. LOAD (Receiver):
The part of the circuit that changes electrical energy into another form of energy.
Example: electrical energy is transformed by the load of the light bulb to light and thermal energy when the light is turned on.

6. 3. Series Circuit

7. Series Circuit:
a circuit in which all parts are connected in a single loop. If one part breaks the circuit will not work.

8. If bulb A burned out, no current could flow through the circuit.8

9. If bulb B burned out, no current could flow through the circuitA 9

10. Question: What would happen if bulb C burned out?10

11. Refrigerator Example:
If your refrigerator was wired by a series circuit and one light bulb burned out, the whole refrigerator would stop working.

12. 4. Parallel Circuits

13. Parallel Circuit
a circuit in which all parts are side by side on different branches.

14. If bulb A burned out there would still be current the could flow through the circuit.

15. If bulb B burned out there would still be current the could flow through the circuit.A B C

16. Question: What would happen if bulb C burned out?

17. Quick Review:

18. Sample Question 1: Which circuit is a parallel circuit?B A

19. Sample Question 2:This is a parallel and series circuit mixed together
Sample Question 2:This is a parallel and series circuit mixed together. What would happen if Bulb C burned out? Would the circuit still work? C A B D

20. Sample Question 3:This is a parallel and series circuit mixed together
Sample Question 3:This is a parallel and series circuit mixed together. What would happen if Bulb B burned out? Would the circuit still work? A C B