Resistivity Flashcards

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1
Q

What’s resistance a property of?

A

A component

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2
Q

What’s resistivity a property of?

A

A material

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3
Q

What 3 things does the resistance of a wire depend on?

A

Length
Cross-sectional area
Resistivity

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4
Q

When does the resistivity change?

A

When the temperature changes

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5
Q

What does doubling the length of a wire do to its resistance?

A

Doubles it

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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

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7
Q

What does changing the material so it has twice the resistivity do to resistance?

A

Doubles it

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