P3 - Resistance and I-V Characteristics

Question 1

What does the term IxV Characteristics refer to?

Answer 1

I-V Characteristics refer to a graph that shows how potential difference (V) and Current (I) are related

Question 2

What formula is used to calculate the I-V characteristics?

Answer 2

V=IR
Potential difference (V) = Current (I) x resistance (R)

This can be transposed to -
R=V/I

Question 3

Resistance can be __________ or non-___________, give an example of each?

Answer 3

Linear, example - a fixed resistor at a fixed temperature

Non-Linear, example - a filament lamp

Question 4

What does linear mean?

Answer 4

A linear value is directly proportional

Question 5

What does non-linear mean?

Answer 5

A non-linear value is variable depending on external factors e.g. as the filament of a lamp heats up its resistance increases.

Question 6

Which of the following are linear and which are non-linear?

A, LDR (light dependant resistor) under constant conditions.
B, a filament lamp.

Answer 6

A, = Linear 
B, = non-Linear