Capacitance Flashcards
1
Q
A way to measure the time constant when voltage falls. (time taken)
A
initial voltage / e
2
Q
How does a voltage v charge graph look like?
A
straight line through origin
3
Q
What is the dielectric constant?
A
permittivity of medium / permittivity of free space
4
Q
How polar molecules cause a change in capacitance?
A
- There is an electric field between the plates.
- Polar molecules align with their positive side facing the negative plate
- Producing a counter electric field
- The potential difference reduces between the plate but charge remains the same
thus capacitance increases
5
Q
How does a current v time graph look like for (charging)
A
exponential decrease
