1
Q
What’s resistance a property of?
A
A component
2
Q
What’s resistivity a property of?
A
A material
3
Q
What 3 things does the resistance of a wire depend on?
A
Length
Cross-sectional area
Resistivity
4
Q
When does the resistivity change?
A
When the temperature changes
5
Q
What does doubling the length of a wire do to its resistance?
A
Doubles it
6
Q
What does doubling the width of a wire do to its resistance?
A
Changes area- 2πr^2= 4A
Means resistance drops by a quarter
7
Q
What does changing the material so it has twice the resistivity do to resistance?
A
Doubles it
