Ch21: Capacitors

Question 1

Define Capacitance.

Answer 1

The charge stored per unit P.d

Question 2

What is the equation which defines capacitance?

Answer 2

C = Q/V

Question 3

How do you calculate total capacitance of multiple capacitors in series?

Answer 3

1/Ctotal = 1/C1 + 1/C2 ….. + 1/Cn

Question 4

How do you calculate total capacitance of multiple capacitors in parrallel?

Answer 4

Ctotal = C1 + C2 + C3 ….

Question 5

What is the capacitance equation for work done?

Answer 5

W=1/2V^2C

Question 6

What is the relationship between P.D and work done on a capacitor?

Answer 6

Double P.D, quadruple work done: squared relationship.

Question 7

What are two practical uses of a capacitor?

Answer 7

Camera flash, smoothing capacitor.

Question 8

How does a smoothing capacitor work?

Answer 8

Converts AC into DC by charging up on the peak, and discharging when the Voltage is stopped by a diode.

Question 9

What happens to charge when a circuit splits into parallel?

Answer 9

The charge split, due to conservation of charge. and is relative to the capacitance of the branch.

Question 10

What happens to voltage over parallel branches of a circuit?

Answer 10

It stays the same. But within a series circuit it is divided in a ratio to components.