Final Exam Flashcards
What form is phasor voltage
V = Ae^xj
What is the RMS of an AC voltage and its equation?
It means root mean square and it serves as a value for that simplifies AC voltages for the majority of people. Equation is RMS = V(peak)/(2)^0.5
What is the RMS of an AC current and its equation?
It means root mean square and it serves as a value for that simplifies AC currents for the majority of people. Equation is RMS = I(peak)/(2)^0.5
What is the equation for average power?
P = (Current rms)(Voltage rms) x cos(angle v - angle current)
When do you use average power?
For AC circuit
Explain power correction
A circuit runs most efficiently when the resistance is purely real and therefore power of voltage source is purely real. This is done using a capacitor in parallel, which will counteract the negative imginary component of other systems
Unit for capacitance
Farads
Unit for inductance
Henries
Farads is the unit for?
Capacitance
Henries is the unit for?
Inductance
How are capacitors added?
Capacitors are the opposite of resistors where:
C(Parallel)=C(1)+C(2)
C(Series)=(1/C(1)+1/C(2))^-1
How are inductors added?
Inductors are like resistors:
L(Parallel)=(1/L(1)+1/L(2))^-1
L(Series)=L(1)+(2)
What are the three different types of power?
Real power, apparent and reactive power
The resistance of a cable formula
R = (ro)*Length/Cross Sectional Area
Power factor equation
real power/apparent power or cos(Angle(v)-Angle(I))
Equation for average power with power correction factor
Paverage = |Vs| |IS| (power-factor) / 2
Golden rule for amplifiers
I-=I+ = 0
V+=V-
How do you convert |gain| to gain in dB
gain db = 20log( |gain| )
Equation for the voltage of a transformer
V(p)/V(s)=N(p)/N(s)
Equation for the current of a transformer
I(p)/I(s)=N(s)/N(p)
When does cut off frequency occur?
When 20log(|gain|) = 3
When doing superposition how do you get rid of the current/what happens when you set the current to 0?
You remove the current suppliers from the system completely
When doing superposition how do you get rid of the voltage/what happens when you set the voltage to 0?
You set the voltage to 0 and put a wire through the battery
What are the three main Op am configs
inverting and non-interting configurations, voltage divider
Solving I in and V in stuff
You sub I in = 0 and V in = 0 and you get a linear line
Negative or positive for amps at the top/which terminal does ground connect to?
Negative is at the top and positive at the bottom/
positive connects to ground
A method to achieve various op amp configs with varying signs etc.?
Use mutliple inverting amps connected together
Method for solving circuits using mesh?
Batteries are always a voltage rise but positive or negative depending on whether the current you work against or with the battery.
Resistors etc. are always a voltage drop
When solving op amps R2 is always?
Furtherest from the ground
When solving op amps R1 is always?
Closest to the ground
