1. What is an electrical current?

2. Copy and complete this table:

 

3. A current of 6.5 A flows through a hairdryer for 5 minutes. What is the charge that flows through the hairdryer during this time?

 

4. When playing a game, an Xbox 360 has 1368 coulombs of charge flowing through it an hour. What is the current flowing through the console?

 

5. The current in a small torch bulb is 0.20 A.

(a) What is the total electric charge which passes a point in the circuit in 12 minutes?

(b) Each electron has a charge of 1.6 x 10^-19 C.How many electrons pass this point in this time?

 

6. Calculate the number of electrons passing a point in the wire in 1 min when the current is:

(a) 1 A

(b) 5.0 μA

 

7. Calculate the number of electrons passing a point in a circuit when there is a current of:

(a) 4.0 A for 60 s

(b) 12 mA for 25 s