Day 2 Notes

Question 1

Inductors/inductance also known as

Answer 1

Coil
Choke
Solenoid

Question 2

Inductor/inductance reference designator

Answer 2

L

Question 3

Inductor/inductance measures in

Answer 3

Henrys

Question 4

Inductor defined

Answer 4

Electronic component that creates an electro-magnetic field within and around itself as long as current is flowing through it

Question 5

Inductance defined

Answer 5

The opposition to the flow of high frequency alternating current

Question 6

Inductance defined

Answer 6

The opposition to the flow of high frequency alternating current

Question 7

An inductor will __________ _______ _________ __________ ______ at a specific frequency and above

Answer 7

Block or “choke” off AC

Question 8

Schematic symbols

Answer 8

Air core
Iron core
Variable

Question 9

Inductor applications

Answer 9

Frequency filters
Switches / relays
Time delay
AC choke
Solenoid
Audio systems
Tx-transmission Rx- receiver

Question 10

A good inductor will indicate a

Answer 10

Low resistance (10-200ohms)

Question 11

An open inductor will indicate

Answer 11

Infinite resistance

Question 12

A shorted inductor will indicate

Answer 12

Zero resistance

Question 13

Does DC circuits have frequency?

Answer 13

Only when inductors are added to it

Question 14

As DC has no frequency, inductors can be used in DC circuits as ____________ ___________ ___________ and for _________ __________ for motor circuits to produce ________ currents

Answer 14

Temporary magnets (relays)
Time delays
Ramp

Question 15

E(A)/I(T) are considered

Answer 15

Instantaneous

Question 16

Inductor

Answer 16

Draw

Question 17

As long as current continues to flow through the coil, the __________ ___________ field around the coil remains, Magnetizing the __________ __________

Answer 17

Electro magnetic
Iron core

Question 18

The ________ _______ around the inductor “induces” a voltage in the inductor

Answer 18

Magnetic energy

Also know as Electro motive force

Question 19

The voltage induced in the inductor is the opposite __________ to the applied voltage

Answer 19

Polarity

Also known as counter electro motive force

Question 20

The opposite polarity “_________” the applied current

Answer 20

Delays

Question 21

When E(A) Volts is applied the inductor momentarily “Appears” as an “_________” to I(T) current

Answer 21

Open

Question 22

When S is open the inductor action happens in

Answer 22

Reverse

Question 23

AC is a constant state of

Answer 23

Transition

Question 24

The CEMF in AC developed within the inductor is ___________ in its opposition to alternating current

Answer 24

Constant

Question 25

The opposition to AC is

Answer 25

Reactance (X) in ohms Inductive reactance (X L)

Question 26

The level of opposition to AC (X L) is determined by

Answer 26

The size of the inductor (L) The frequency of the applied AC (F) The trigonomic constant 2pie (6.28)

Question 27

X L (inductive reactance) equation

Answer 27

2pieFL 6.28*F (frequency/hertz) * L (inductor/henry)

Question 28

Frequency is measured in

Answer 28

Hertz (F)

Question 29

Inductor is measured in

Answer 29

Henry (L)

Question 30

Impudence is measured in

Answer 30

Ohms (Z)

Question 31

BECAUSE INDUCTORS "REACT” TO CHANGING FREQUENCIES, THEY ARE CONSIDERED, .

Answer 31

"FREQUENCY SENSITIVE" DEVICES

Question 32

BECAUSE OF THE CONSTANT PRESENCE OF CEMF, THE APPLIED VOLTAGE WILL ALWAYS "________" THE APPLIED CURRENT BY 90°

Answer 32

Lead E L I

Question 33

TYPICALLY INDUCTORS WELL ALWAYS BY USED IN CONJUNCTION WITH AN ADDITIONAL ___________

Answer 33

COMPONENT (R)

Question 34

WHEN A RESISTANCE IS INCLUDED In an inductive circuit, THE difference IN_________[_ ___________ MUST BE ADDRESSED

Answer 34

PHASE RELATIONSHIP

Question 35

RESISTORS-E AND I ARE "____ __________"

Answer 35

IN PHASE

Question 36

INDUCTORS- E AND I ARE

Answer 36

90 OUT OF PHASE

Question 37

IN A series R/L CIRCUIT VOLTAGE ACROSS THE INDUCTOR WILL "LEAD" THE

Answer 37

VOLTAGE ACROSS THE resistor BY 90 degrees

Question 38

OUT OF phase PARAMETERS MUST BE "____________" BACK TO ACCOUNT FOR THE PHASE DIFFERENCE.

Answer 38

COMPENSATED

Question 39

THE TOTAL Opposition to AC in a COMPENSATED CIRCUIT IS CALLED;

Answer 39

"IMPEDENCE" (Z)

Question 40

Power FACTOR: (PF) .

Answer 40

* THE Ratio OF THE PHASE Relationship BETWEEN RESISTANCE AND Inductance

Question 41

IN A PURELY resistive CIRCUIT PF equals

Answer 41

1

Question 42

IN a PURELY REACTIVE Circuit PF =

Answer 42

0

Question 43

IN AN R/L circuit PF equals

Answer 43

Less than 1