Flashcards in Keywords and formulas Deck (56):

1

## (wheatstone bridge) what does R1/R2 equal to?

### R3/R4

2

## What does R1 equal to in the delta to wye transformation

### (RaxRb)/(Ra+Rb+Rc)

3

## What does R2 equal to in the delta to wye transformation

### (RaxRc)/(Ra+Rb+Rc)

4

## What does R3 equal to in the delta to wye transformation

### (Ra+Rb)/(Ra+Rb+Rc)

5

## What is an essential node?

### A node where 3 or more elements join

6

## What is a node?

### A point where two or more circuit elements join

7

## What is a path?

### A trace of adjoining elements where no elements included more than once

8

## What is a branch?

### A path which connects two essential nodes.

9

## What is an essential branch?

### A path which connects two essential nodes without passing through any other essential nodes.

10

## What is a loop?

### A path whose last node is the same as the starting node

11

## What is a mesh?

### A loop that does not enclose any other loops

12

##
What is a Planar circuit?

### A circuit that can be laid out on a plane iwht no crossing branches

13

## What does Rth equal?

### (Voc)/(Isc)

14

## What load of resistance will give rise to maximum power transfer into the load?

### The same amount of resistance as Rth

15

## Does a Thevenin equivalent circuit include a resistor in parallel or in series?

### In series

16

## Does a Norton equivalent circuit include a resistor in parallel or in series?

### In parallel

17

## What are capacitors?

###
-Capacitors store energy in the form of electric charge

-Capacitors oppose the change in voltage across their terminals

-Change in voltage across the plates causes current to flow through the capacitor.

18

## What is the formula for the voltage across a capacitor when discharging

### Vc=Voexp(-t/RC)

19

## What is the formula for voltage across a capacitor when charging

### Vc=Vf[1-ecp(-t/RC)]

20

## What are inductors

###
-An inductor stores energy in the form of a magnetic field surrounding its coil

-Inductors oppose the change in current through their terminals (or coil)

-Change in current causes voltage to be developed across the inductor terminals (due to magnetic flux)

21

##
whats the time constant of a Resistor-Inductor circuit

### L/R

22

## Is a diode a semiconductor

### yes

23

## what are diodes commonly used for?

### rectification- turning AC into DC

24

## What do diodes do to current?

### they only allow current to flow in one direction

25

## What is the forward voltage drop of silocon

### 0.7v

26

## What is the forward voltage drop of Germanium

### 0.3v

27

## What is the forward voltage drop of Gallium Arsenide

### 1.8v

28

## What do zener diodes do

### breakdown safely under reverse bias conditions

29

## What is breakdown voltage also known as

### Zener voltage

30

## What do you do to semi conductors to turn them into p-type and n-type materials

### dope them

31

## How are diodes made

### the fusion of a PN junction

32

## what type of IV curves do diodes have

### non linear

33

## What does a sinusoid signal v(t) equal to

### Vmsin(wt+%)

34

## What is the phasor transform formula?

### v(t)=Re(Vexpjwt)

35

## What are the phasor relationships for capacitors and inductors

###
current leads voltage by 90 degrees (capacitors)

inductors- voltage leads current by 90

36

## Z?

### V/I

37

## resistance?

### /z/cos%

38

## Y?

### 1/z

39

## Conductance?

### /Y/cos%

40

## suceptance?

### /Y/sin%

41

## Why are bipolar junction transistors usefull?

### small curents can be used to controll much larger ones

42

## what are the 2 different types of transistor?

### PNP NPN

43

## What are the 3 terminal devices

###
collector

base

emitter

44

## What are the characteristics of an ideal voltage amplifier

### Av=infinity Ri=infinity Ro=0 They are differential amplifiers

45

## Application of negative feedback

### Negative feedback is commonly used in op amp circuits to reduce the gain and improve the properties of the amplifier.

46

## What is the repercussion of the gain being assumed to be fininte? (non inverting amplifier)

### V-=V+=Vi

47

## equation of vi in a non inverting amplifier?

### Vo x (R2)/(R1+R2)

48

## What is the result of assumed infinte gain on a inverting amplifier?

### V-=V+=0

49

## What is V- called in a inverting amplifier?

### Virtual earth

50

## Formula for G? (non inverting)

### [Vo/Vi]=[R1+R2/R2]

51

## Formula for G? (Inverting)

### [Vo/Vi]=-(R1/R2)

52

## What does an inverting Summing amplifier do?

### it is used to add up0 a number of voltages as in superposition

53

## formula for Vo in a inverting summing amplifer?

### Vo=-V1(R1/R2)-V2(R1/R3)

54

## What does a differential amplifier do?

### A differential amplifier can be used to amplify the differences between two voltages

55

## What is the formula for Vo for a differential amplifer?

### Vo=(V1+V2)R1/R2

56