Capacitance

Question 1

What is the equation for capacitance?

Answer 1

C=Q/V

Question 2

What is the definition of capacitance?

Answer 2

The amount of charge that can be stored per unit potential difference across it

Question 3

What is the total amount of charge on both plates of a capacitor at any given time?

Answer 3

Zero

Question 4

What is the equation for a capacitor with a dielectric?

Answer 4

C= Area x E0 x relative permittivity/ distance between plates

Question 5

If there is a constant current, what equation should be used?

Answer 5

CV=It

Question 6

Where can a capacitor be used?

Answer 6

Defibrillators, measuring small time intervals

Question 7

What is the equation for energy in a capacitor?

Answer 7

QV/2 or CV^2/2 or Q^2/2C

Question 8

What does the gradient of a QV graph give you?

Answer 8

1/Capacitance

Question 9

What does the area below a QV graph give you?

Answer 9

Energy stored in capacitor?

Question 10

What characteristics limit what a capacitor can store?

Answer 10

Q≈A Q≈ 1/D Q≈Er

Question 11

What is the equation for capacitors discharging as a function of time?

Answer 11

Q= Q0 e^-t/RC