10.5 Potential divider circuits Flashcards
1
Q
What is a potential divider circuit?
A
A simple circuit that uses 2 resistors (or thermistors/ LDRs) in series to a supply a variable output potential difference.
2
Q
What is the equation used with potential divider circuits?
A
V1/V2=R1/R2
Vout=(R(1 or 2))/(R1+R2) x Vin
3
Q
What is loading a potential divider?
A
Loading refers to connecting a component or circuit to Vout, that is, placing a component in parallel with R2. This lowers the resistance of this part of circuit and so lowers Vout. Adding a large load has little effect on the Vout, but if the load has a small resistance Vout is significantly reduced.
