The Potential Divider

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Use a potential divder to get a fraction of a source voltage.

  • Simple version- Potential divider is a circuit with a voltage source with a few resistors in series.
  • The potential of the source is divided in the ratio of the resistances. 
  • eg. in a circuit with 2 resistors. R1 has R1/(R1+R2) of the total resistance.
  • So, V(out)=Vs(R1/(R1+R2))
  • This type of circuit is mainly used for calibrating voltmeters which have a very high resistance.

Addingd a LDR or thermistor

  • An LDR has a very high resistance in the dark, but lower…


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