Analogue Electronics Flashcards
A parralel-plate capacitor consists of…?
Two conductive plates seperated by a dielectric layer
Does net charge cross a capictor?
No
What do capacitors try to do to the voltage across the plate?
Try to keep it constant
What does the cicrcuit symbol for capacitance look like?
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
What is the equation for charge?
q=Cv
What is the relationship between current and voltage?
v(t) = ?
This is the graph of voltage vs time, what would charge vs time and current vs time look like?
Voltage is the intergral of…?
Current
w(t) = ?
w(t) = ½vq = q^{2 }/2c =
If this is v-t, what would i-t, p-t and w-t look like?
How do you work out the total capacitance for capacitors in parralel?
Add them up (suppose to be C_{3} - it’s in the book)
How do you work out the total capacitance for capacitors in series?
1/C
What’s the equation for the capacitance of a parallel plate capacitor?
What does an inductor look like?
Basic equations for inductor/conductance?
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!
Capacitors don’t like…?
Instantaneous changes in voltage
Inductors don’t like…?
Instantaneous changes in current
V_{1}(t) = ?
V_{1}(t) = V_{s}(1-e^{-t/2})
2 equations
L/R and
3 equations
And V = IR & V = CR
For infinite steady state; (what type of circuit)
- Inductors = ?
- Capcitors = ?
- Voltage across the capacitor = ?
- Inductors = closed/short circuit
- Capacitors = Open circuit
- 0V
How is the homogeneous equation obtained?
By setting the forcing function to zero
- What is the forcing function?
- And if we have a circuit without sources, what is the forcing function?
- And what is the forcing function for dc sources?
- A function of only resistances and the inductance (or capacitance)
- 0
- Constant
How is the natural response obtained?
By solving the homogeneous equation
V_{RMS} = ?