Basic Components of a Circuit Diagram Video Lecture | Science Class 10

Stan jubileus Co here once again a
little more of a tutorial in reading and
drawing schematic diagrams based on this
book beginner's guide to reading
schematics published by mcgraw-hill
third edition just came out in October
of 2013 courtesy of yours truly Stan's
obelisco and the name of is probably cut
off at the bottom of the screen here but
as you can see underneath this book I
have quadrille paper otherwise known as
graph paper and I would like to
introduce some very basic symbols that
engineers use in schematic diagrams the
resistor the capacitor fixed capacitor
here is a diode semiconductor diode and
here
is an electrochemical battery the minus
terminal in the battery symbol is the
short line positive terminal is the long
line I that always confuses me because
when you take a flashlight cell for
example a double a cell or a D cell the
flat side like that is the negative
terminal and then the little button is
positive so I've always been a little
bit confused as to why they did it like
that this is in any case a battery a
diode the cathode is that line the anode
is that arrow electrons flow through a
semiconductor diode against the arrow
this is electron flow now and they can't
generally flow in the direction of the
arrow but conventional current which
goes from plus to minus flows in the
direction of the arrow actually direct a
conventional current doesn't flow
because the actual objects that move in
the inner conductor like this or
electrons a little bit of theory for you
there the capacitor fixed capacitor
you may wonder why one of these lines is
curved and the other one is straight
once in a while is an alternative symbol
you'll just see two straight lines like
that but the curved line is generally
the one that goes more directly to
chassis ground or earth ground notice
the difference in the ground symbols
earth ground is like a ground rod driven
right into the soil a direct connection
to that or an electrical ground like the
electrical ground in your utility
outlets which goes ultimately to a
ground rod like that a chassis ground is
the common connection on a circuit board
the metal chassis of an older piece of
electronic equipment anyway the curved
line generally goes more directly to
ground when you have a capacitor with
one curved symbol like that the resistor
the way I like to do it is seven seven
zigzags like one two three four five six
seven like that that is the conventional
symbol for a resistor you may
occasionally see a resistor symbolized
like this but anyway this is a fixed
resistor if you want to indicate a
variable resistor or potentiometer you
have a tap and that's indicated by an
arrow that goes like that so you slide
this tap or move this tap along the
resistance element and you can kind of
intuitively see what will happen this is
an electro chemical
battery if you want to indicate a solar
battery like a bunch of solar cells
connected together you put a couple
little arrows zero like that then you
get a solar battery so those are just a
few very basic symbols schematic symbols
that you will encounter others that you
may see an incandescent bulb looks
something like this
whereas a light-emitting diode bulb
would look something like that a diode
with a little circle and some arrows
sometimes the circle isn't there so
those are a couple more schematic
symbols that you will occasionally
encounter as you work your way through
electricity and electronics speaking of
which I may also recommend this book for
you teach yourself electricity and
electronics the fifth edition is the
most recent the current edition also by
yours truly and also whose name is cut
off at the bottom of the screen but heck
you know I've been cut off at the bottom
of people's screens all my life I'm used
to it so you get these two books
together and I think they make a pretty
good combination just in my opinion
stands abisco from the Black Hills of
Dakota Territory United States of
America until next time so long