1. ELECTRICAL CIRCUITS

2. What is an electric current? Electric Current - a flow of electrons from the (+) terminal to the (-) terminal of a cell/battery through wires and components + -

3. Open and Closed Circuits Open circuit = switch is open = no current is flowing = bulb does not light Closed circuit = switch is closed = current is flowing = bulb lights up

4. Circuit Diagram Cell/Battery Switch Bulb Wires Resistor in a bulb Resistor

5. Circuit Diagram

6. Types of Circuits Series Circuits – current takes only one path and is the same at all the points

7. Series Circuits If one bulb blows out, it breaks the circuit and all the bulbs go out If you add more cells/batteries to a series circuit, the bulbs burn brighter

8. Types of Circuits Parallel Circuits – current takes more than one path and is NOT the same at all the points

9. Parallel Circuits If one bulb blows out, there is still another complete circuit for the bulb to stay lit

10. Conductors and Insulators Conductors – objects in which electrical current easily passes through such as metals Insulators – objects that resist the flow of electrical current such as plastic, wood, paper, and rubber

11. Conductor or Insulator? Conductor

12. Open or Closed? Closed

13. Brighter or Dimmer? Dimmer

14. Series or Parallel? Series

15. Brighter or Dimmer? Brighter

16. Series or Parallel? Parallel

17. Open or Closed? Closed

18. Series or Parallel? Series

19. Series or Parallel? Parallel

20. B

21. A - Resistor

22. B - Switch

23. C - Bulb

24. D – Wire

25. E - Cell/Battery

26. A – Parallel B – Series