Capacitance 4.1

Question 1

Define a capacitor?

Answer 1

consists of 2 conductors (plates) separated by an insulator (dielectric)

Question 2

formula for charge

Answer 2

Charge = Capacitance X voltage

Question 3

define capacitance?

Answer 3

the charge needed to raise pd by 1 v (c)

Question 4

formula for energy of capacitance?

Answer 4

e = 1/2 capacitance X voltage ^2

Question 5

in capacitors in parallel total charge is…

Answer 5

Qt = Q1 + Q2 + Q3 +….

Question 6

in capacitors in parallel total capacitance is…

Answer 6

Ct = C1 + C2 + C3 +…

Question 7

in capacitors in series total charge is…

Answer 7

Qt = Q1 = Q2 = Q3 = ….

Question 8

in capacitors in series total capacitance is…

Answer 8

1/Ct = 1/C1 + 1/C2 + 1/C3 +…

Question 9

Capacitor charges quickly when…

Answer 9

Little resistance in the circuit

Question 10

Capacitor charges slowly when…

Answer 10

Lots of resistance in the circuit

Question 11

Exponential decay equation?

Answer 11

Charge = Initial Charge X e ^-1/Resistance X capacitance X time

(same goes for current and voltage)

Question 12

Time constant ?

Answer 12

time taken for charge to drop by a factor of 1/e

Question 13

equation for time constant?

Answer 13

Time constant = resistance X capacitance

Question 14

link between area and capacitance

Answer 14

Capacity is directly proportional to area of the plates.

Question 15

link between distance between plates and capacitance

Answer 15

Capacitance is inversely proportional to the distance between plates.

Question 16

conducting plates formula?

Answer 16

capacitance = @ X Area / Dst between plates

Question 17

@? (epsilon)

Answer 17

8.85 X 10^-12

Question 18

whats the constant epsilon mean?

Answer 18

Permittivity of the dielectric

Question 19

define electric field

Answer 19

region where an object experiences a force define uniform eletric field

Question 20

define uniform electric field?

Answer 20

region where the field strength is same in magnitude in all directions

Question 21

define the electrical potential energy?

Answer 21

work it can do due to its position in the field.

Question 22

define the potential difference?

Answer 22

work done per unit charge

Question 23

equation for speed of particle between plates?

Answer 23

v = root(2 charge voltage / mass)

Question 24

KE gained by particle =…

Answer 24

EPE lost by the particle