Thermistors

Question 1

What happens to the resistance of a thermistor?

Answer 1

• Resistance of a thermistor decreases when the temperature increases.

Question 2

What does the graph look like?

Answer 2

• high temperatures= Low resistance.

- Low temperatures= High resistance. `

Question 2

What does the graph look like?

Answer 2

• high temperatures= Low resistance.

- Low temperatures= High resistance. `

Question 3

What happens under cool conditions in a computer?a

Answer 3

• Resistance of thermistor is high.
• Takes alot of energy to allow the current drive through the resistor: Potential difference is high in the thermistor.
• Potential difference is shared so:
• PD across the fan is low so operates very slow.

Question 4

What happens under hot conditions in a computer?a

Answer 4

• Hot conditions= Resistance in thermistor is low.
• Not alot of energy is needed to drive the current through the thermistort.
• Potential difference:
• Across thermistor= low.
  -Across fan= high (so works at fast rates).
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