Chapter 21-

Question 1

What is a capacitor

Answer 1

It is an electrical component in which charge is separated.

It has two metal plates separated by an insulator

Question 2

Definition of capacitance

Answer 2

The charge stored per unit p.d

Question 3

Equation of capacitance

Answer 3

Q = VC

Question 4

Capacitance in Parallel

Answer 4

P.d across capacitors is the same.
Electrical charge is conserved - Sum across each charge
Total capacitance is sum of individual capacitors/

Question 5

Capacitors in Series

Answer 5

P.d is sum of individual p.d’s
Charge is same across each capacitor
Total capacitane is 1/ capacitance

Question 6

What directions does an electron flow in a capacitor

Answer 6

From the negative to positive plate

Question 7

What does the area under a graph represent

Answer 7

Work Done

Question 8

What is the work done equation

Answer 8

W = VQ

Question 9

What is the equation for energy stored

Answer 9

W = 1/2 QV

Question 10

What are the other two equations for energy stored

Answer 10

W = 1/2 V^2 C
W = 1/2 Q^2 / C

Question 11

What is the time constant of a capacitor

Answer 11

tau = CR

V /e x 0.37