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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
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