Final Exam

Question 1

What form is phasor voltage

Answer 1

V = Ae^xj

Question 2

What is the RMS of an AC voltage and its equation?

Answer 2

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

Question 3

What is the RMS of an AC current and its equation?

Answer 3

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

Question 4

What is the equation for average power?

Answer 4

P = (Current rms)(Voltage rms) x cos(angle v - angle current)

Question 5

When do you use average power?

Answer 5

For AC circuit

Question 6

Explain power correction

Answer 6

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

Question 7

Unit for capacitance

Answer 7

Farads

Question 8

Unit for inductance

Answer 8

Henries

Question 9

Farads is the unit for?

Answer 9

Capacitance

Question 10

Henries is the unit for?

Answer 10

Inductance

Question 11

How are capacitors added?

Answer 11

Capacitors are the opposite of resistors where:
C(Parallel)=C(1)+C(2)
C(Series)=(1/C(1)+1/C(2))^-1

Question 12

How are inductors added?

Answer 12

Inductors are like resistors:
L(Parallel)=(1/L(1)+1/L(2))^-1
L(Series)=L(1)+(2)

Question 13

What are the three different types of power?

Answer 13

Real power, apparent and reactive power

Question 14

The resistance of a cable formula

Answer 14

R = (ro)*Length/Cross Sectional Area

Question 15

Power factor equation

Answer 15

real power/apparent power or cos(Angle(v)-Angle(I))

Question 16

Equation for average power with power correction factor

Answer 16

Paverage = |Vs| |IS| (power-factor) / 2

Question 17

Golden rule for amplifiers

Answer 17

I-=I+ = 0

V+=V-

Question 18

How do you convert |gain| to gain in dB

Answer 18

gain db = 20log( |gain| )

Question 19

Equation for the voltage of a transformer

Answer 19

V(p)/V(s)=N(p)/N(s)

Question 20

Equation for the current of a transformer

Answer 20

I(p)/I(s)=N(s)/N(p)

Question 21

When does cut off frequency occur?

Answer 21

When 20log(|gain|) = 3

Question 22

When doing superposition how do you get rid of the current/what happens when you set the current to 0?

Answer 22

You remove the current suppliers from the system completely

Question 23

When doing superposition how do you get rid of the voltage/what happens when you set the voltage to 0?

Answer 23

You set the voltage to 0 and put a wire through the battery

Question 24

What are the three main Op am configs

Answer 24

inverting and non-interting configurations, voltage divider

Question 25

Solving I in and V in stuff

Answer 25

You sub I in = 0 and V in = 0 and you get a linear line

Question 26

Negative or positive for amps at the top/which terminal does ground connect to?

Answer 26

Negative is at the top and positive at the bottom/

positive connects to ground

Question 27

A method to achieve various op amp configs with varying signs etc.?

Answer 27

Use mutliple inverting amps connected together

Question 28

Method for solving circuits using mesh?

Answer 28

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

Question 29

When solving op amps R2 is always?

Answer 29

Furtherest from the ground

Question 30

When solving op amps R1 is always?

Answer 30

Closest to the ground