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13 - DC Circuits (13.5 - The potential divider (Sensor Circuits…

- - - - Simple audio volume control to change loudness of sound from speaker. Audio signal -> potential divider = variable output pd to loudspeaker
      - Vary brightness of light bulb between zero and normal brightness. Enables current through the light bulb to be reduced to zero
  - - - Consist of potential divider made using a thermistor and variable resistor
      - Temp in thermistor constant, source pd is dived between thermistor and variable resistor. Variable resistor can be adjusted to make any desired value on thermistor. When temp changes its resistance changes = change in pd across
    - - Pd across LDR changes when incident light intensity on LDR changes. If light intensity increases, resistance of LDR falls and pd across LDR falls
      - Uses light dependent resistors(LDR) and a variable resistor.