6.3 Resistance

Question 1

What is resistance?

Answer 1

A measure of how difficult it is to get current to flow through a component

Question 2

What is resistance measured in?

Answer 2

Ohms

Question 3

What is the equation for resistance?

Answer 3

Resistance = potential difference / current

Question 4

What is ohms law?

Answer 4

Provided the physical conditions remain constant, current through an ohmic conductor is directly proportional to the potential difference across it

Question 5

What are ohmic conductors?

Answer 5

Conductors that obey ohms law

Question 6

What does a graph of current against potential difference look like for an ohmic conductor?

Answer 6

A straight line graph, increasing (/)

Question 7

What factors can have an affect on resistance?

Answer 7

Light level
Temperature

Question 8

Is ohms law always obeyed?

Answer 8

Ohms law is a special case, lots of components will not obey and have different current-voltage graphs