Digital Electronics Video Lecture | Physics for JAMB

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before going ahead with part 29 I am
that we start with digital electronics
and here we will discuss only the basics
or only the building blocks of digital
electronics and nothing else and the
building blocks of digital electronics
and nothing but logic gates so before we
start with logic gates we will see what
is what is our digital signal and what
is an analog signal so what is a digital
signal and an analog signal so when we
talk about an analog signal we are
talking about signals in the form of
continuous time varying voltage or
current that mean signals which are
continuous or changing with time
continuous in the sense let us suppose
if you plot some signal let us suppose
it is some signal and decide as your
time so this is how the signal varies
that means it is varying continuously at
every point of time it is having some
different value and the curve which you
get it looks continuous so these kind of
signals are called analog signals
whereas when I when we talk about
digital signals we are talking about
signals which are in discrete form these
are the two key words discrete and
continuous discrete means this is time
and this is my signal I say that the
signal is high at this point of time the
signal becomes low again at this point
of time the signal becomes very high at
this point of time so that means here if
you see the signal has discrete values
this time the signal is high this time
the signal is low this time the signal
is high this time the signal is low so
that means the signal is in discrete
form it can either be high or it can be
low it cannot be anything in between but
when we talk about analog signals it is
like the variation is continuous it can
be any
and the variation takes place
continuously in this case if you see at
between these two instances the
variation was instant it was high and
instantly became low but here it was at
some value and then gradually it keeps
changing little little value so that is
called as continuous variation so that
is how we differentiate between an
analog signal and a digital signal so
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