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Electronics > Electronics > Flashcards

Electronics Flashcards

1
Q

Mass

A

Amount of matter in an object

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2
Q

Electricity

A

Invisible power carried by wires

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3
Q

Magnetic lines of flux

A

Move from north to south
Continuous
Never Cross each other
Pass through all materials

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4
Q

Bread board

A

Used for temporary circuits

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5
Q

Left hand rule

A

Forefinger points in the direction of the field

Second hand points in the direction of current
Thumb points in direction of force

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6
Q

How electricity is made

A 
Pressure
Heat
Magnetism
Light
Friction
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7
Q

Types of current

A 
Non renewable (fossil fuels)
Renewable (clean energy)
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8
Q

Ac and DC

A

DC: produced in batteries , static and lightning

AC: electricity that you get from power points

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9
Q

Free electrons

A

Move freely from one aton to another

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10
Q

Conductors

A

Materials that allow the flow of current

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11
Q

Insulators

A

Materials like glass rubber are called insulators. They resist flow of electricity

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12
Q

Semiconductors

A

Materials that allow and resist flow of current

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13
Q

Ionic bonding

A

Electrons are completely transferred from one atom to another

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14
Q

P type semicindictor

A

Adding impurity atoms to silicon that has only one three valence electrons

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15
Q

Resistors

A 
Fixed resistors
Variable
Potentionetor
Thermistor
Photoresistors
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16
Q

Forward bias

A

Applied voltage moves from positive to negative

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17
Q

Reverse bias

A

When applied voltage moves from negative to positive

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18
Q

Led

A

Lights up when current is passed through it

Used in HiFi equipment

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19
Q

Zener diode

A

Reverse bias

Used in regulation

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20
Q

Varactor

A

Reverse bias

Used in tuning circuits

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21
Q

Photo diodes

A

Reverse bias

Used in light sensitive circuits

22
Q

Restricted

A

Not allowed without permission

23
Q

Earth

A

Yellow . green

24
Q

Live

A

Brown

25
Q

Neutral

A

Blue

26
Q

Effects of electrical shock

A

Muscles tighten
Breathing stops
Lungs tighten

27
Q

How to free a victim from shock

A

Dont touch a victim
Turn off the power
Use an insulator to free victim
Keep victim lying down

28
Q

Why should we test appliances

A

Establish whether:
Current flow exists
Ac or DC force
Measure the value

29
Q

Digital meter

A

LCD display
More expensive
Mostly accurate

30
Q

Analogue

A

Uses a needle as pointer
Not as accurate
Cheaper

31
Q

Care for your instruments

A

Replace battery when low
Remove battery if you leave instruments for more than a month
Don’t connect circuits to live circuits

32
Q

What happens if you don’t take care of instrumwnts

A

Electrical shock
Injury
Death
Damage to property

33
Q

Inspesct instruments

A

Breakage
Wear
Signs of overheating
Loose fixtures

34
Q

Hazards can harm

A

People
Property
Processes

35
Q

Soldering tools

A 
Soldering iron
Solder sucker
Wire stripper
Long nose plier
Jewellers screwdrivers
36
Q

Dry joint

A

A point that hasn’t been soldered properly

37
Q

Contamination

A

To make something dirty or dangerous

38
Q

Oxidation

A

Rusting caused by water, chemicals and oxygen

39
Q

Planning a sequence

A 
Identify
Prepare
Do it
Assess or evaluate
Complete
40
Q

Simple circuit to work

A

Source of electrical potential
Conductive path
Electrical resistor

41
Q

Pcb

A

Printed circuit board

42
Q

Simple circuits

A

Flipflop light
Running led
Doorbell

43
Q

What makes a plc

A

Input and Output
Microprocessor
Power supply
Memory

44
Q

Groups of field devices

A

Motherboards
System drives
Bus devices
Peripherals

45
Q

Red
Yellow
Green

A

Off
No program
Run

46
Q

FM

A

Frequency modulation

47
Q

Network

A

Bus network
Ring network
Star network

48
Q

PSTN

A

Public switched telephone networks

49
Q

PABX

A

Private automatic branch exchange

50
Q

Crosstalk

A

One signal affects another nearby signal

51
Q

Multiplexing

A

Sending two or more message s or signals at the same time using a multiplex system

52
Q

Three main kinds of data

A

Bus
Ring
Star

Electronics (1 decks)

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