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# Current

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1. Current

2. Amount of electric charge that passes by a point in an amount of time. • Unit is called Amps • # of coulombs each second • Measurement of the flow of electrons

3. I = Current (amps) Q = Charge (coulombs) T = Time (seconds)

4. Demonstration • We counted the number of cups that passed a location in a circuit in an amount of time • We could then determine the number of cups which pass that location each second • AMPs; # of coulombs (cups) per second

5. 6 Cups (coulombs) pass a point in a circuit in 1 second. • Find the AMPs of current

6. 6 Cups (coulombs) pass a point in a circuit in 2 seconds. • Find the AMPs of current

7. 6 Cups (coulombs) pass a point in a circuit in 3 seconds. • Find the AMPs of current

8. 6 Cups (coulombs) pass a point in a circuit in 6 seconds. • Find the AMPs of current

9. Voltage

10. Voltage • Measurement of the stored energy by separating electrons • Amount of energy on each charge. • Volts • # of joules on each coulomb

11. V = Voltage (volts) E = Energy (joules) Q = Charge (coulombs)

12. 1.5 Volts

13. 6 Volts

14. 12 Volts

15. 18 Volts

16. 24 Volts

17. Demonstration • Cups can hold different amounts of water • Coulombs can have different amount of energy • The amount of water depends of how much water is available in a pail • The amount of energy depends on the voltage of the battery

18. 1 Volt battery puts 1 drop in the cup • 2 Volt battery puts 2 drops in the cup • 3 Volt battery puts 3 drops in the cup 12 11 10 9 8 7 6 5 4 3 2 1

19. A 6 Volt battery loads 6 Joules of energy (drops of water) onto each coulomb of charge (cup) 6J

20. A 12 Volt battery loads 12 Joules of energy (drops of water) onto each coulomb of charge (cup) 12J

21. 12J

22. Electric Circuits

23. Direct Current • Flow of electrons in one direction

24. Alternating Current • Flow of electrons back and forth during regular cycles

25. How do electrons flow?

26. What happens to the current in the charge doubles but the time stays the same?

27. What happens to the current in the charge is halved but the time stays the same?

28. What happens to the current in the charge stays the same but the time doubles?

29. What happens to the current in the charge stays the same but the time is cut in half?