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Flashcards in Analogue Electronics Deck (77)
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1

A parralel-plate capacitor consists of...?

Two conductive plates seperated by a dielectric layer

2

Does net charge cross a capictor?

No

3

What do capacitors try to do to the voltage across the plate?

Try to keep it constant 

4

What does the cicrcuit symbol for capacitance look like?

5

What does a capacitor represent in terms of fluid flow analogy?

A capacitor represents a reservoir with an elastic membrane separating the intlet and outlet 

6

What is the equation for charge?

q=Cv

7

What is the relationship between current and voltage?

8

v(t) = ?

9

This is the graph of voltage vs time, what would charge vs time and current vs time look like?

10

Voltage is the intergral of...?

Current

11

w(t) = ?

w(t) = ½vq = q/2c = 

12

If this is v-t, what would i-t, p-t and w-t look like?

13

14

How do you work out the total capacitance for capacitors in parralel?

Add them up (suppose to be C3 - it's in the book)

15

How do you work out the total capacitance for capacitors in series? 

1/C

16

What's the equation for the capacitance of a parallel plate capacitor? 

17

What does an inductor look like?

18

Basic equations for inductor/conductance?

19

How do you work out inductors in series and in parallel?

  • In series  
    • You add them
  • In parallel 
    • You do 1/L 

It's exactly the same as resistors! 

20

Capacitors don't like...?

Instantaneous changes in voltage

21

Inductors don't like...?

Instantaneous changes in current

22

V1(t) = ?

V1(t) = Vs(1-e-t/2)

23

2 equations 

 

 

L/R and

24

 3 equations

And V = IR &  V = CR

25

26

For infinite steady state; (what type of circuit)

  • Inductors = ?
  • Capcitors = ?
  • Voltage across the capacitor = ?

  • Inductors = closed/short circuit
  • Capacitors = Open circuit
  • 0V

27

How is the homogeneous equation obtained?

By setting the forcing function to zero

28

  1. What is the forcing function?
  2. And if we have a circuit without sources, what is the forcing function?
  3. And what is the forcing function for dc sources?

  1. A function of only resistances and the inductance (or capacitance)
  2. 0
  3. Constant 

29

How is the natural response obtained?

By solving the homogeneous equation 

30

VRMS = ?