Topic 3.2 Resistance and Resistivity

Question 1

Name 3 Physical factors than could affect the resistance of a wire

Answer 1

Cross Sectional Area, Length, Resistivity

Question 2

How does increasing the length of a conductor affect its resistance?

Answer 2

Increases

Question 3

How does increasing the CSA affect resistance?

Answer 3

Larger CSA = Lower Resistance

Question 4

Define resistivity

Answer 4

A property that determines its resistance to current flow

Question 5

What does a higher resistivity do?

Answer 5

Increases resistance

Question 6

Equation for factors that affect resistance of conductor

Answer 6

R = pL/A

Question 7

How does the potential along a wire vary as you move along it?

Answer 7

Potential increases

Question 8

What is the terminal potential difference of a supply?

Answer 8

The actual potential difference that is produced across the terminals

Question 9

Define internal resistance

Answer 9

Internal resistance of a power supply is the electrical resistance with the materials of the supply

Question 10

What is a semiconductor

Answer 10

A component that can change its resistance based on external conditions (e.g LDR)

Question 11

Describe how resistance of a thermistor changes with decreasing temperature

Answer 11

Resistance increase

Question 12

Describe how the resistance of a LDR changes as light intensity increases.

Answer 12

Resistance decreases

Question 13

What is a potential divider

Answer 13

A pair of resistors that split pd