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Electronics > Rectifiers and Battery Chargers: Part A > Flashcards

Rectifiers and Battery Chargers: Part A Flashcards

1
Q

Rms stands for?

A

Root mean square

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2
Q

Average dc value is equal to what?

A

Instantaneous value at any time

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3
Q

One cylce is represented as how many °

A

360°

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4
Q

Period (t) is a time measured over?

A

One complete cycle. 360°

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5
Q

Period foumula

A

T= 1/f

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6
Q

Frequency formula

A

F = 1/T

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7
Q

Peak value is known as

A

Maximum value

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8
Q

Peak to peak value if a sine wave is voltage or current?

A

Both

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9
Q

Peak to peak is always how much

A

Twice the peak voltage

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10
Q

Veff formula

A

Vmax/root2

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11
Q

Effective value is also known as

A

Rms value

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12
Q

Vrms formula?

A

Vmax/root2

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13
Q

Voltmeters read what type of voltage

A

Effective/rms

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14
Q

Averge value of a sine wave taken over a complete cycle is always ?

A

Zero because + / - values

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15
Q

Meter set to dc on a pure ac source will read

A

Zero

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16
Q

Double subscript notation is used when

A

Polarity of one point in a cct with respect to second point

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17
Q

What does a dc meter measure

A

Average

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18
Q

Touch lead together of a ohm meter reads

A

Zero

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19
Q

Olm meter OL means

A

Open cct

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20
Q

Ammeter has a resistance of

A

Zero

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21
Q

Oscilloscope measure

A

Harmonics, ground fault test current abd instrumentation signals

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22
Q

Transducer on oscilloscope

A

Converts the measured quantity into a voltagw signal and displays a graph

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23
Q

If two scope leads each have a reference lead, should both reference leads be connected go the cct or isolated

A

One isolated

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24
Q

Valence electrons the most outershell

A

Valence shell

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25
Q

Conductors have high or low resistance?

A

Vety low resistance

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26
Q

Good conductors have how many valence electrons?

A

One two or three cause little energy is required for dislodge the electrons from the atom

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27
Q

Electrons that loosely bound to the atom are called

A

Free electrons. Cause little resistance
Like copper gold silver aluminum

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28
Q

Elements that have 5-8 valence electrons behave as?

A

Insulators

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29
Q

Semiconductors as insulators

A

Neither good or bad insulators

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30
Q

Semi condutors have how many valene electrons

A

4

31
Q

What material is most commonly used in a semi conductor?

A

Silicon
But germanium is also used

32
Q

Electronic devices made from semi conductor are known as

A

Solid state devices

33
Q

Colalent bonds has how many valence electrons?

A

Each atom shares itd four valence electrons with the adjoining stoms causing material to act as a if each atom had 8 electrons in the outer shell

34
Q

Voltage is applied to ptype material the tendecy is for electrons too

A

Shift into holes closer to the positive terminal and leaving behind new holes

35
Q

Photoconductive cells are known as

A

Light dependent resistors LDR

36
Q

When energy is applied to semi conductor material what happens to electrons

A

Break their covalent bond

37
Q

What is photoconduction?

A

Property that exhibits lower resistance when exposed to light energy

38
Q

PN junction

A

P type and n type material formed side by side in the same semi conductor

39
Q

Diode behaves as a

A

Switch

40
Q

Arrow head points towards

A

Away from anode and towards the cathode

41
Q

Barrier voltage of germanium?

A

0.3v

42
Q

Barrier voltage of silicon

A

0.7v

43
Q

A diode that will not allow current to flow if the anode is negative with respect to the cathode is called

A

Reverse bias

44
Q

Ideal reverse diode resistance is

A

Infinity

45
Q

Characteristic curve vertical and horizontal

A

Vertical is current
Horizontal is voltage

46
Q

Voltages above safe maximum that cause diode to break down are called

A

Breakdown voltage and avalance voltage

47
Q

Diode current ratings?

A

Low
Medium
High

48
Q

Medium current diodes are?

A

Stud mounted or press fit

49
Q

Stud mounted with a pigtail diodes are typically in what Amp range

A

150a to 500a

50
Q

Type of large current carrying diode

A

Hockey puk

51
Q

VRRM

A

Repetitive reverse maxium

52
Q

Reverse voltage rating can be listed as

A

Vrrm
Vpr

53
Q

How to check a diode

A

Multimeter or component tester

54
Q

3 common diodes

A

Freewheeling
Directional
Rectifier

55
Q

Freewheeling diode is used,m

A

Control the destructive effect of the cemf ehen the switch is opened in a dc cct

56
Q

Freewheeling diode is also known as

A

Suppression or
Protection

57
Q

Other names for directional diodes?

A

Blocking
Steering
Isolating

58
Q

Diodes and batteries

A

Diodes prevent tje battery with the highest voltage from acting like a power source and discharging into other batteries

59
Q

Fire alarm bells use what type of diode

A

Blocking diodes

60
Q

Led stands for

A

Light emitting diode

61
Q

Rectifter changes what

A

Ac to dc

62
Q

Two types of doped semi conductive materials

A

P type
N type

63
Q

When light shines on a LDR what happens to the resistance

A

Decreases

64
Q

Open switch reads how much v

A

Source voltage

65
Q

Open switch reads how much current

A

Zero

66
Q

Closed switch reads how much vols

A

Zero

67
Q

Closed switch reads how much current

A

It will read how ever many amps

68
Q

Why is effective voltage used in ac

A

Effective heat

69
Q

What is frequently

A

Cycles per second

70
Q

Vp formula

A

Vrms/0.707

71
Q

Ntype has what charge

A

Neutral but behaves negative

72
Q

Ptype charge is

A

Neutral but behaves postive

73
Q

What is a simple and practical method of showing correct battery connection polarity?

A

Use a light emitting diode

Electronics (3 decks)

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