1. Electricity Comes Alive
Electrical Current

2. Do Now:
Compare the exemplar Annotation to your quiz (in mailbox). What strategies were used that you did not use?

3. Definitions current: RATE OF CHARGE FLOW unit: C/s or AMPERE requires:
POTENTIAL DIFFERENCE
PATH FOR FLOW

4. Example #1
100 coulombs of charge pass through point A in 4.0 seconds.
What is the rate of current flow through point A?
I = Δq / t
I = 100 C / (4.00 s)
I = 25 A A

5. Example #2
During a thunderstorm a lightning strike transfers 15.0 coulombs of charge in 10.0 milliseconds.
What was the electrical current produced in the strike?
I = Δq / t
I = 15.0 C / (10 x 10-3 s)
I = 1.5 x 105 A

6. Example #3 A wire carries a current of 50 amperes. I = Δq / t
How much charge flows through the wire in 10 seconds?
How many electrons pass through the wire in 10 seconds?
I = Δq / t
50 A = q / (10 s)
q = 500 C
3.125 x 1021 e

7. End of PRACTICE