P3 - Resistance and I-V Characteristics Flashcards

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1
Q

What does the term IxV Characteristics refer to?

A

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

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2
Q

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

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

This can be transposed to -
R=V/I

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3
Q

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

A

Linear, example - a fixed resistor at a fixed temperature

Non-Linear, example - a filament lamp

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4
Q

What does linear mean?

A

A linear value is directly proportional

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5
Q

What does non-linear mean?

A

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

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6
Q

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

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

A
A, = Linear 
B, = non-Linear
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