1. Day 54 End of Topic 7! Starting Topic 8.

2. Time for it to be in HW Turn In: ◦ HW: Titled Day 53, Day 49, Day 48. ◦ Lets do it The Lab: For about 4 minutes, with partners make sure you are all going to be ready

3. HW Miniquiz 1st

6. So a bunch of new ideas are coming your way that still deal with charges

7. Current In the wire at every point, a bunch of charge is flowing every moment. Current is the Flow of Charge through a conductor

8. FUN CREATIVE TIME PAPER RULER SCISSORS COLOR?

9. Create horizontal lines every 4.6cm across That should be 6 sections

13. Voltage A field creates a force in the wire. Its like a difference in Potential (like a push) on the ends of the wire push charge through. Current flows from High Potential to Low Potential. A difference in Potential causes currents to flow. Back to the chart…

14. Ohms Law The relationship between Electric Potential, Resistance and Current

16. Resistance Different wires can have different flows There are 4 different properties that affect the resistance. More resistance with the same potential difference means LESS current Back to the chart…

18. River Analogy Electric IdeaRiver Example

20. Example One: A metal wire is connected between two battery leads. In an hour, 3 coulumbs flowed. If the wire is 75 ohms, A) How much electric potential is there on the wire?

21. Example Two: A metal wire is connected between two battery leads. In an hour, 3 coulumbs flowed. If the wire is 75 ohms, B) If the high lead is 3 volts, what is the low?

22. Example Four: Which of the following changes to a wire will always bring about an increase in current? A) Increase voltage and increase resistance B) Decrease voltage and decrease resistance C) Increase voltage and decrease resistance D) Decrease voltage and increase resistance

23. Example Four: Which of the following changes to a wire could bring about an increase in current? A) Increase voltage and increase resistance B) Decrease voltage and decrease resistance C) Increase voltage and decrease resistance D) Decrease voltage and increase resistance

24. Example Five: You Try An outlet has two prongs, + (120 volts) and – (0 volts). You place a 20 Ω wire from the + prong to a 30 volt battery. The battery charges in 20 minutes. How much charge flowed?

25. And Now… Try it out on the HW