Capacitance

Question 1

What do capacitors effectively consist of?

Answer 1

2 conducting plates (electrodes)

Question 2

What are the two conducting plates seperated by?

Answer 2

An insulator known as a dieletric

Question 3

Give 3 examples of dielectrics.

Answer 3

Air,

Oil,

Paper

Question 4

What is the gradient of a potential difference against charge graph?

Answer 4

The reciprocal of capacitance.

1/C

Question 5

define capacitance

Answer 5

charge stored per volt

Question 6

what is capacitance measured in?

Answer 6

CV^-1

Question 7

microfarads symbol and how many x10^ what?

Answer 7

µ and x10^-6

Question 8

nanofarads symbol and how many x10^ what?

Answer 8

n and x10^-9

Question 9

picofarads symbol and how many x10^ what?

Answer 9

p and x10^-12

Question 10

E = 1/2QV can also be written as:

Answer 10

E = 1/2CV^2 and E = 1/2 x Q^2/C

Question 11

how do you charge a capacitor?

Answer 11

by connecting it to a battery

Question 12

how do you discharge a capacitor?

Answer 12

take the battery out and then reconnect the battery

Question 13

what does the time taken to charge/discharge depends on what 2 factors?

Answer 13

capacitance and resistance

Question 14

the charge on a capacitor decreases how?

Answer 14

exponentially

Question 15

what is the time constant?

Answer 15

the time taken for charge on a discharging capacitor to fall 37% or time taken for a charging capacitor to rise 63%

Question 16

larger the resistance, the ……. it takes to ……….

Answer 16

longer, charge/discharge