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…