Current Equation Flashcards

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1
Q

Charge Carrier Density

A

The number of mobile charge carriers per cubic metre

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2
Q

What’s the charge carrier density of a metal?

A

Large- making them good conductors

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3
Q

What’s the resistivity of a metal?

A

Very low

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4
Q

What’s the charge carrier density of a semi-conductor?

A

Low

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5
Q

What’s the resistivity of a semi-conductor?

A

High

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6
Q

What happens in metals when the temperature increases?

A

Mean drift velocity decreases due to increased lattice vibrations- increases resistivity

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7
Q

What’s the charge carrier density of an insulator?

A

Very low

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8
Q

What’s the resistivity of an insulator?

A

Huge

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9
Q

What happens in NTC’s as temperature increases?

A

Number of charge carriers increases, reducing resistivity
Increased lattice vibrations too, but this increase in resistivity is small compared to the number of charge carriers released

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10
Q

What happens in an LDR when there’s more light?

A

More charge carriers are released using the energy transferred, increasing the charge carrier density- lower resistivity

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