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What is an electric

circuit?

An electric circuit is a

path, which allows

current moves from a

point of high potential

energy to one of low

potential.

What is a source?A source is an electrical

device, which supplies

electrical energy

What is a load?

A load is an electrical

device, which convertsthe electrical energy from

the source into some

other form of energy

Name 4 basic

components of an

electr ic circui tThe name 4 basic

components of an electric

circuit are: a source, a

load, a transmission

system and a control.

What is a cell?A cell is a component of

an electric circuit, which

changes a form of energy

(usually chemical energy)

into electrical energy.

What is a generator?

A generator is a device,

which converts

mechanical energy into

electrical energy.

What is conductor?

The conductor is a

material, which allows

electrons to flow through

it

What is insulator?

The insulator is amaterial, which electrons

cannot flow through it

What is a solar cel l?

A solar cell is an electric

cell, which convert

sunlight into electricalenergy

How does cur rent move?

Current moves from a

point of high potential

energy to once of low

potentialWhat is an electric

motor?

An electric motor is a

machine, which convert

electrical energy into

mechanical energyWhat is the principle of

an electric motor?

The principle of an

electric motor is the

current is placed in a

magnetic field, a force isproduced on the

conductor. The

interaction of the forces

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produced by the magnetic

field of the rotor and the

stator makes the rotor

spin

What are effects of a

current?

The effects of an electric

current are thermal,

luminous, chemical andmagnetic.

Give some examples of

thermal effect of current

Some examples of

thermal effect of current

are heated irons, heatedthe filament of the light

bulb or heated metal rods

of the fireplace

Give some examples of

luminous effect of

currentSome examples of

luminous effect of the

current the filament of the

light bulb emits intense

white light or the test

lamp glowsWhat are some

applications of magnetic

effect of current?

Some applications of

magnetic effect of current

are it can magnetizemagnetic material and

attract them to conductor

(electric relay) or if a

current carrying

conductor is placed in a

magnetic field, a force

will be exerted on it

(electric motor)

What is a ground wave?

A ground wave is a wave,

which travels round the

surface of the earth forshort distances

What is a sky wave?

A sky wave is a wave

which travels skyward to

reach the ionosphere then

it is reflection back to theearth

What is a space wave?

A space wave is a wave,

which part of the

transmitted signal travel

in a direct line from thetransmitting antenna to

receiving antenna and

partly are reflected from

ground

What are two factors that

affect attenuation ofground waves?

Two factors that affect

attenuation of ground

waves are the nature of

the surface and frequency

of the signal

What are two factors that

determine the bending

effect of the ionosphere?

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Two factors that

determine the bending

effect of the ionosphere

are the frequency of

signal and the angle of

radiation

What is a cathode?

A cathode is a negative

electrode which emitselectrons

What is an anode?

A anode is a positive

electrode which attracts

electrons

What is a line scansignal?

A line scan signal is part

of a video signal, which

controls the movement of

spot across the television

screenWhat is a line sync

pulse?

A line sync pulse is part

of a video signal, which

adjusts the timing for the

display of a frame on atelevision screen

What is modulation?

The modulation is a

method, which changes

high frequency according

to a low frequency signal

What is AM?

AM is a modulation

method, which amplitude

of the carrier wave is

changed according to the

amplitude of the

modulating signal while

the frequency of the

carrier is kept constant

What is FM?

FM is a modulation

method, which frequencyof the carrier wave is

varied in proportion to

the amplitude of the

modulating signal while

amplitude of the carrier

wave is kept constantWhen is a diode forward-

biased?

A diode is forward-biased

when the positive of the

source is connected to the

p-side of the diode andthe negative of the source

to the n-side

When is a diode reverse-

biased?

A diode is reverse-biased

when the positive of thesource is connected to the

n-side of the diode and

the negative of the source

to the p-side

What is a transistor?

A transistor is asemiconductor

component with three

electrodes ( emitted, base

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and collector) which used

for switching, amplifying

and electronic signal

How many levels do logic

gates have?

There are 2 levels do

logic gates: a high level

and a low level. The high

level is presented by 1and the low level by 0

Name some common

logic gates

Some common logic gates

are AND, OR, NOR, XOR

and NAND gates andinverters

Name some common

transmission l ines

Some common

transmission lines are

coaxial cable, parallelwires, twisted pair,

waveguide and optical

fibres.

What is multicasting?

Multicasting is part of the

base specification inIPv6, which transmission

of the packet to multiple

destinations in a single

send operation

What is a LED?

LED is a semiconductorwhich converts electrical

energy into light

What is a metal detector?

A metal detector is an

electronic device which

indicates the presence of

objects under the ground

What is an exchange?

An exchange is a

switching center for

switching signals from

one telephone live toanother

What is an integrated

circuit?

An integrated circuit is a

chip, which used to

control the deviceWhat is the main

advantage of IPv6 over

IPv4?

The main advantage of

IPv6 over IPv4 is its

larger address space