IV characteristics

Question 1

How can the behaviour of different components be tested ?

Answer 1

By using these circuits:
One with a variable resistor and the component to be tested in parallel with a voltmeter and an ammeter is series

Question 2

What does the iv graph for an ohmic resistor look like ?

Answer 2

A straight line running through the origin

Question 3

What does an iv graph for a thermistor look like ?

Answer 3

It goes through the origin but starts off increasing rapidly then slows down

Question 4

What does the in graph of a semiconductor look like ?

Answer 4

Is starts at the x axis just above as a straight line then gradually increases

Question 5

How can resistance be found using an iv graph ?

Answer 5

Reading the values for V and I at a point calculating the R using V=IR

Question 6

How to increase and decrease gradients ?

Answer 6

Components with a constant resistance will give a straight line (ohmic conductor)
As I and v increase the thermistor heats up so the resistance decreases and gradient increases
Semiconductor diode has INFINITE RESISTANCE ( gradient=0 horizontal line)
Below a certain pd after which the resistance is very low so the gradient is steep

Question 7

What are the name of conductors that obey ohms law ?

Answer 7

Ohmic conductors and they give a straight line

Question 8

What are the name of conductors that don’t obey ohms law

Answer 8

Non ohmic conductor and doesn’t give a straight line