1. Do Now (5 mins): Define “electric field”.
Draw an uniform electric field between two parallel plates. Make the top plate negatively charged.
Describe the motion of a negatively charged object in the electric field.
When the negatively charged object moves towards the negative plate, does it gain electric potential energy or lose?

2. Charge & Electrical Current

3. A bad idea

5. Conductors have “Free Electrons”+ -

6. Current = Flow of Free Electrons
Current = Flow of Charge + -

7. Electrical Current
It is the flow of charge (the “charge” is most often electrons).
It is measured by the rate at which electric charge flows. (i.e. how fast the charges flow)
Remember: C of charge = 6.25 x 1018 electrons

8. Simulation: Current

9. Current is the amount of charge, q, passing a point every second.

10. Current I = current (measured in __________)
q = charge (measured in ________)
t = time
The current, I, is the amount of charge, q, passing a point per second.

11. Examples:
If there is 10 A of current flowing through a wire, how much charge is passing a point in five seconds?
If a total charge of 0.12 C passes a point in 3 seconds, what is the size of the current?

12. More Examples:
20 Coulombs of charge passed through a light bulb in 4 seconds. What is the current?
0.02 C of charge passed through a resistor in one minute. What is the current?
If the current is 0.3 Amps, how many coulombs of charge will pass a point in ten minutes?

13. Question: In which direction is the “current” flowing?

14. Conventional Current
Conventional Current refers to the movement of “positive” charge, which moves from a positive terminal to a negative terminal.
But the electrons actually move in the opposite direction, as they are “negative”
The direction of the conventional current is always the opposite of the direction of the movement of electrons.

17. Homework Booklet: Static Electricity Q1, 2, 3, 4
Worksheets ONE & TWO
Textbook Activity 15A Q5, 6, 7, 8, 9, 10
Homework Booklet: Static Electricity Q1, 2, 3, 4