circuit devices (LDR, thermistor, fixed/variable resistors)

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SENSING CIRCUITS: turn on/increase power of components depending on the conditions they are in

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8 Terms

1
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what is a thermistor?

a temperature-dependent resistor

2
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how does the temperature affect the resistance of the thermistor?

temperature increase = thermistor resistance decreases

3
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when are thermistors useful?

  • temperature detectors

    • car engine temperature sensors

    • electronic thermostats

4
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what is a light dependent resistor (LDR)?

a light intensity detector

5
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how does an increase in light intensity affect the resistance of the LDR?

light intensity increase = LDR resistance decrease

6
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what are LDRs used for?

  • automatic night lights

  • outdoor lighting

  • burglar detectors

7
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what is a fixed resistor?

  • Ohmic conductor

  • resistance does not change with current

8
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what is a variable resistor?

  • opposes flow of current in a circuit

  • its resistance can be varied