1. P2 5.1 ELECTRIC CIRCUITS Difference between cell and battery? Difference between an indicator lamp and a bulb? 1 2 3 4 5

2. Difference between cell and battery? Difference between an indicator lamp and a bulb? 1 2 3 4 5 SYMBOLSFUNCTION

3. SYMBOLS 1 2 3 4 5 FUNCTION

4. 1 2 3 4 5 SYMBOLSFUNCTION

5. 1 2 3 4 5 SYMBOLSFUNCTION

6. 1 2 3 4 5 SYMBOLSFUNCTION

7. 6 7 8 9 10 SYMBOLSFUNCTION

8. 6 7 8 9 10 SYMBOLSFUNCTION

9. 6 7 8 9 10 SYMBOLSFUNCTION

10. 6 7 8 9 10 SYMBOLSFUNCTION

11. 6 7 8 9 10 SYMBOLSFUNCTION

12. 6 7 8 9 10 SYMBOLSFUNCTION

13. Measuring Current An Ammeter measures the size of the c……….. It measures it in amperes (also called amps or A). Are these components in series or in parallel?

14. k = ….. A l = ….. A m = ….. A n = ….. A 0 = ….. A p = ….. A

15. Bulbs in Series A * Bulbs in series are dimly lit * If one bulb breaks the other goes out Bulbs in Parallel A * Bulbs in parallel are bright * If one bulb breaks the other stays on Used in houses and car head lampsUsed in some Christmas tree lights

16. Bulbs in Series A * Bulbs in series are dimly lit * If one bulb breaks the other goes out Bulbs in Parallel A * Bulbs in parallel are bright * If one bulb breaks the other stays on Used in houses and car head lampsUsed in Christmas tree lights

17. Bulbs in Series A * Bulbs in series are dimly lit * If one bulb breaks the other goes out Bulbs in Parallel A * Bulbs in parallel are bright * If one bulb breaks the other stays on Used in houses and car head lampsUsed in some Christmas tree lights

18. Is a torch circuit series or parallel ?

19. Measuring currents in circuits An electric current is the flow of tiny charges called electrons around a complete circuit. We measure current in units called amps using an ammeter in series. Build the following circuits and write down the ammeter reading: 0.4 A 0.2 A A 1. A A A A 2.

20. A A 3. “Two bulbs in series are dim ” 4. A A “Two bulbs in parallel are bright ” 5. A A Max current = Min current = A

21. A 7. 6. A 30 cm of thin wire A 60 cm of thin wire A AM

24. At point P: Current in at P = Currents out at P

25. An experiment to show that current is a moving charge Sensitive ammeter Carbon coated ball on nylon thread Van der Graff generator

26. An experiment to show that current is a moving charge Carbon coated ball on nylon thread + + _ _ _ _ The negative charges on the metal plate attract the ball

27. An experiment to show that current is a moving charge Carbon coated ball on nylon thread + + _ _ _ _ The negative charges on the metal plate attract the ball _ _ _ _ The ball receives negative charge and is repelled away carrying the charges across to the other plate

28. An experiment to show that current is a moving charge The faster the charges are carried across from one plate to the other the greater the current flows: Charge = Current X Time Q = I X T Coulombs Ampsseconds

29. Charge = Current X Time Q = I X T Coulombs Ampsseconds Example: Calculate the amount of charge flowing passed a point in a wire carrying a current of 5 Amps in 10 minutes. Q = I X T Q = 5 x 10 x 60 Q = 3000 Coulombs of charge