Att Fc Week 4

Front 1

Transient

Back 1

The relationship between a charge in current and a change in applied voltage

Front 2

In RC time constants, resistance does what?

Back 2

Impedes current flow

Front 3

What is the purpose of RC Time constants

Back 3

To indicate the rate of a charge or discharge of a capacitor

Front 4

Capacitance

Back 4

Determines the amount of charge a capacitor can accumulate

Front 5

How many time constants are required for full charge?

Back 5

5

Front 6

RL time constants

Back 6

Inductors oppose current change, adding resistance to change

Front 7

How many time constants are required for max current?

Back 7

5

Front 8

Time constants current

Increase in inductance causes

Back 8

Increase in time per time constant

Front 9

RC TRANSIENT CIRCUITS FAULTS

Open capacitor

Back 9

Capacitor waveform- identical to input

Resistor waveform- zero waveform

Front 10

RC TRANSIENT CIRCUIT FAULTS

shorted capacitor

Back 10

Capacitor- zero waveform

Resistor- identical to input

Front 11

RC TRANSIENT CIRCUIT FAULTS

open resistor

Back 11

Capacitor- DC component of input

Resistor- AC portion of input

Front 12

RC TRANSIENT CIRCUIT FAULTS

shorted resistor

Back 12

Capacitor- identical to input

Resistor- zero waveform

Front 13

LCR circuits

Back 13

The circuit effect of the inductor and the effect of the capacitor cancel each other

Front 14

Series LCR circuit

XL=XC

Back 14

Purely resistive

Front 15

LCR series circuit

XL>XC

Back 15

Inductive

Front 16

LCR series circuit

XL

Back 16

Capacitive

Front 17

LCR parallel circuits

XL=XC

Back 17

Purely resistive

Front 18

LCR parallel circuits

XL>XC

Back 18

Capacitive

Front 19

LCR parallel circuit

XL

Back 19

Inductive

Front 20

LCR parallel circuit

Back 20

Branch currents determine if circuit is inductive or capacitive

Branch reactance and current are inverse of each other

Front 21

XL AND XC ARE OPPOSITES

XL-XC

Back 21

Negative is capacitive

Positive is inductive

Front 22

Resonance

Back 22

The condition in a circuit when inductive reactance equals capacitive reactance

Front 23

LCR series circuit resonance

Impedance

Back 23

At minimum when LCR is resonant

Front 24

LCR series circuit resonance

Current

Back 24

At maximum

Front 25

LCR series circuit resonance

Voltage

Back 25

Voltage drops across the resistor are maximum at resonance

Front 26

LCR parallel circuit resonance

Impedance

Back 26

Maximum

Front 27

LCR parallel circuit resonance

Current

Back 27

Minimum

Front 28

LCR parallel circuit resonance

Voltage

Back 28

Stays the same or equals applied voltage

Front 29

Long time constant

Back 29

Low EC, high IC, Low XC

Front 30

Short time constant

Back 30

High EC, low IC, high HC

Front 31

How is an open component in an parallel LCR recognized?

Back 31

Branch current measures 0A

Front 32

Voltage drop across a resistor in a parallel resonant circuit with an open inductor

Back 32

Decreases below resonance

Front 33

Transformer

Back 33

Purpose-transfer power

Front 34

Transformer power relationship

Back 34

Voltage and current levels change but power in is always the same as power out

Front 35

Transformer input

Back 35

Applied to primary

Front 36

Transformer output

Back 36

Taken from the secondary

Front 37

Iron core transformer

Back 37

Mostly used in power supplies

Front 38

Air core transformer

Back 38

Most often used in radio circuits

Front 39

Transformer operation

Back 39

Operate on a principle of mutual inductance (ability of a magnetic field of one coil to induce voltage in a second coil)

Front 40

Transformer most common faults

Back 40

Shorts and opens

Front 41

Purpose of a diode

Back 41

To allow current in one direction and stop it in the other direction

Front 42

Anode

Back 42

Represented by an arrow

Positive side

Front 43

Cathode

Back 43

Represented by a bar

Negative side

Front 44

Diode current flow

Back 44

Cathode to anode only

Front 45

Forward biasing

Back 45

Allows current flow

Front 46

Reverse biasing

Back 46

Back (Definition)

No current flow

Front 47

Knee voltage

Back 47

Voltage drop of a diode in forward bias

Front 48

Silicon Voltage drop

Back 48

.7

Front 49

Germanium voltage drop

Back 49

.3

Front 50

Phase relationship of a capacitor and inductor

Back 50

Exactly 180 degrees apart

Front 51

A shorted component in a parallel resonant circuit is indicated by

Back 51

The branch current measures maximum current

Front 52

In an LCR circuit XL and XC...

Back 52

Oppose current at 180 degrees

Front 53

RC TRANSIENTS occur when

Back 53

The voltage across a capacitor changes

Front 54

NTYPE

Back 54

Has free electrons to move

Front 55

PTYPE

Back 55

Has holes free to move

Front 56

Diodes change current flow from

Back 56

AC to DC

Front 57

Forward bias

Back 57

Functions like a closed switch

Front 58

Reverse bias

Back 58

Functions like an open switch