Electricity Comes Alive 4.2.1 Electrical Current

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

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

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

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

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

End of 4.2.1 - PRACTICE