4.2.1 Electrical Current

4.2.1 Electrical Current

​•current (I): RATE OF CHARGE FLOW

•unit: C/s or AMPERE (A)

•requires:

•POTENTIAL DIFFERENCE (V)

•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?

Multiple Choice

•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?

• 1.5 A

• 1500 A

• 0.67 A

• 6.7E-4 A

Multiple Choice

Example 3: A wire carries a current of 50 amperes. How much charge flows through the wire in 10 seconds?

• 0.2 A

• 5 C

• 500 C

​Example 3: Converting coulombs to electrons

​A wire carries a current of 50 amperes. How many electrons pass through the wire in 10 seconds?

Multiple Choice

A phone draws a current of 0.120 amperes from a 3.00 volt battery. What is the total charge that passes through the player in 900. seconds?

• 324 C

• 108 C

• 5.40 C

• 1.80 C