Unit 12

Question 1

How can charges be transferred from one object to another? What happens to the charge of each object during this process?

Answer 1

• by moving electrons

- one becomes positive, one becomes negative

Question 2

What is the definition of current?

Answer 2

• the flow of electrons

- the amount of charges per second moving past a point

Question 3

What direction does current travel

Answer 3

From the positive to the negative terminal

Question 4

What is the definition of electric potential difference (voltage)?

Answer 4

The energy the charges carry

Question 5

What does a battery do in a circuit?

Answer 5

Provides the energy to the circuit

Question 6

What is the definition of resistance?

Answer 6

The hinderence of the flow of electrons/current

Question 7

List the four factors that affect resistance and describe how they affect the resistance

Answer 7

• length of wire: as length goes up, resistance goes up
• temperature: as temperature goes up, resistance goes up
• cross sectional area: as the cross sectional area goes up, resistance goes down
• material: if it is a conductor, resistance goes down. If it is an insulator, resistance goes up

Question 8

What is the difference between a conductor and an insulator?

Answer 8

Conductors allow current to flow, insulators do not