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DC Circuits Class > Day 2 Notes > Flashcards

Day 2 Notes Flashcards

1
Q

Magnetic materials

A

Iron, nickel, cobalt

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2
Q

Non magnetic materials

A

Aluminum, lead, silver, liquids, gases

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3
Q

Reluctance

A

Opposition offered by a material to become magnetized

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4
Q

Permeability

A

The ease at which a material can become magnetized

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5
Q

Residual magnetism

A

Similar to retentivity but weaker

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6
Q

TEMPORY MAGNET:

A

• WHEN A MATERIAL IS MAGENZED
ONLy WHILE UNDER THE INFLUENCE of a MAGnet
EX. ELECTRO-MAGNETIC (RELAy)

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7
Q

PERMANENT MAGUET:
.

A

• WHEN A MATERIAL REMAINS FULLY MAGNETEED AFTER THE MAGNETIC INFLUENCE IS REMOVED

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8
Q

• computer HARDDRIVES INCORPORATE

A

BOTH
TEMPORARY And PERMANENT MAGNET

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9
Q

RESISTANCE:

A

• THE OPROSETION OFFERED BY A COMPONENT OR A DEvice TO THE FLOW OF ELECTRICAL CURRENT.
EVERYTHING HAS SOME LEVEL OF INHERENT RESISTANCE.
RESISTORS: (R) oR (ohms symbol)

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10
Q

RESISTOR CAn BE REPRESENTED AS

A

A specific COMPONENT OR AS A COMPLETE DEVICE (DUMMYLOAD)

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11
Q

• RESISTANCE IS USED TO.

A

CONTROL OR LIMIT THE AMONTS OF VOLTAGE AND OR CURRENT APPLIED TO OR FLOWING
“THROUGH” A COMPONENT, SUSTEM OR DEVICE

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12
Q

• ALL RESISTANCES ARE MEASURED IN UNITS called

A

OHMS

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13
Q

What are the resistor ratings

A

Ohmic value
Wattage

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14
Q

Power dissipation for resistors

A

Watts

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15
Q

The maximum amount of dissipation from a resistor is based on what?

A

Resistors size

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16
Q

Average resistor sizes

A

1/8
1/4
1/2
1
2

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17
Q

When/if a resister fails it must be replaced by

A

A resistor with same or greater value

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18
Q

Types of resistors

A

General purpose resistors
Power resistors
Precision resistors

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19
Q

General purpose resistors are also known as

A

Carbon resistors

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20
Q

2 types of carbon resistors

A

Carbon composite
Carbon film

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21
Q

How do you determine carbon resistors values

A

In ohms

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22
Q

THE CARBON RESTSTOR COLOR COPE:black

A

0

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23
Q

THE CARBON RESTSTOR COLOR COPE:brown

A

1

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24
Q

THE CARBON RESTSTOR COLOR COPE:red

A

2

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25
THE CARBON RESTSTOR COLOR COPE:orange
3
26
THE CARBON RESTSTOR COLOR COPE:yello
4
27
THE CARBON RESTSTOR COLOR COPE:green
5
28
THE CARBON RESTSTOR COLOR COPE:blue
6
29
THE CARBON RESTSTOR COLOR COPE:violet
7
30
THE CARBON RESTSTOR COLOR COPE:grey
8
31
THE CARBON RESTSTOR COLOR COPE:white
9
32
THE CARBON RESTSTOR COLOR COPE:tolerance gold
5%
33
THE CARBON RESTSTOR COLOR COPE:tolerance silver
10%
34
THE CARBON RESTSTOR COLOR COPE:tolerance no band
20%
35
THE CARBON RESTSTOR COLOR COPE:multipliers gold
*.1
36
THE CARBON RESTSTOR COLOR COPE:multipliers silver
*.01
37
Power resistors are also known as
Wire wound
38
Power resistors are typically used for
High voltage and current applications
39
Carbon composite resistors look like
Cylinders
40
Carbon film resistors look like
Bones
41
Power resistors ohms is located where?
Printed on body
42
Examples of power resistors
Motor controls/ power distribution
43
Precision resistors also known as
Military specification
44
Precision resistors price
Most expensive
45
Precision resistors are typically used for
Where system failure is a limited or non-acceptable option
46
Precision resistors are typically used for
Where system failure is a limited or non-acceptable option
47
Precision resistors ohms values are designated using
Alpha numeric codes
48
Power resistors tolerances
+/- 1% +\- 5%
49
Precision resistors tolerances
+\- .1% +\- .25% +\- .5% +\- 1% +\- 2% +\- 5%
50
2 types of variable resistors
Potentiometer Rheostat
51
Variable resistor type I
Potentiometer
52
Variable resistor type II
Rheostat
53
TYPE I - POTENTIOMETER USED
USED IN ELECTRONIC CIRCUITS TO VARY LOW VOLTAGES /CURRENTS
54
TYPE II- RHEOSTAT used in?
USED IN AC CIRCUITS AND RESDENTIAL WIRing to CONTROL AC VOLTAGES /CURRENTS
55
POTENTIOMETER examples
• VOLUME CONTROL •MOTOR SPEED CONTROL • CALIBRATION
56
RHEOSTAT examples
• CEILING FANS • LIGHT DIMMERS • INDUSTRIAL CONTROLS
57
IF/WHEN A RESISTOR FAILS IT WILL TYPICALLY FAIL AS AN "______" WHERE THE RESISTANCE WILL RISE TO _________. THUS, CURRENT DROP TO _______!
Open INFINITY ZERO
58
A resistor could ALSO FAIL AS A "_______” WHERE RESISTANCE DROPS TO ______: THUS CURRENT FLOW______ TO POSSIBLE DANGEROUS LEVELS.
SHORT ZERO RISES
59
RESISTANCES IN SERIES IS THE _____ OF THE INDIVIDUAL RESISTIANCES MAKING UP THE SERTES CIRCUIT.
Sum R(T)=R(1)+R(2)+R(3)……….
60
RESISTANCES IN SERIES IS THE _____ OF THE INDIVIDUAL RESISTIANCES MAKING UP THE SERTES CIRCUIT.
Sum R(T)=R(1)+R(2)+R(3)……….
61
PRECISION RESISTANCE CODE: 3572 FJ
1st-3rd #-significant digit 4th #-multiplier 1st letter-tolerance 2nd letter-failure rate
62
PRECISION RESISTANCE CODE: power rating watts
RN 55 - 1/8 WATT RN60 - ¼ WATT RN65 - ½ WATT
63
PRECISION RESISTANCE CODE: 615TRW
MANUFACTURE'S PRODUCT RUN/PART NUMBER
64
PRECISION RESISTANCE CODE: tolerance B
.1%
65
PRECISION RESISTANCE CODE: tolerance C
.25%
66
PRECISION RESISTANCE CODE: tolerance D
.5%
67
PRECISION RESISTANCE CODE: tolerance F
1%
68
PRECISION RESISTANCE CODE: tolerance G
2%
69
PRECISION RESISTANCE CODE: tolerance J
5%
70
PER 1000 HRS.continuous use
J- .001 % G -.01 % H-. 1 %)
71
RESISTOR COLOR CODE:
1st-2nd-significant number 3rd-multiplier 4th tolerance

DC Circuits Class (7 decks)

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