1. Electrical Circuits Objective: What is a simple circuit? How does electricity flow through a simple circuit to produce heat, light, and sound?

2. 1. What is a closed circuit? An electrical circuit allows the movement of electrical energy.

3. Closed Circuit

4. 1. What is an open circuit? This is an electrical circuit that prevents the movement of electrical energy.

5. Open circuit

6. 2. Basic Parts of Circuit

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

8. 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.

9. Reality Check: What is a simple circuit? How does electricity flow through a simple circuit to produce heat, light, and sound?

10. 3. Series Circuit

11. Series Circuit: A circuit that allows only one path for the flow of electricity.

12. Series Circuit: This type of circuit will not work if one or more light bulbs go out.

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

14. If bulb B burned out, no current could flow through the circuit A BC

15. Question: What would happen if bulb C burned out? A BC

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

17. 4. Parallel Circuits

18. Parallel Circuit This is a circuit that allow electric current to flow along more than one path.

19. Parallel Circuit This type of circuit will work if one or more light bulbs go out.

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

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

22. Question: What would happen if bulb C burned out? A B C

23. Quick Review:

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

25. 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

26. 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