The Potential Divider

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…