Hello.
Today we will look at participation in our system of resistance generate heat and the component must
be able to submit this here to prevent damage.
Physical size.
The surface area available to this Betty is a good indicator indicator of how much heat Bauer at a store
can handle.
Measured in Watts common values are a quarter have 1 5 10 et cetera.
Now let's look at this example there's a store and circuit series looking at the current path.
If there is only one bath the component are in cities.
As you can see here there is only one current path flowing through these resistors so the stores are
in series and the main this thing shell between series and by circuit is how many bath is the current
has available to complete the course from the negative wall to the power source to the post office or
both.
In this diagram all comments from the battery must pass through both registers.
Therefore that circuit series circuit at the point unit developed the concept of equivalent resistance
equivalent resistance is what the total resistance would be if you sub substituted a singular as a store
that is a store that make up the circuit.
In this case if that all the stores were to be combined and replaced with a single resistor that had
the same resistance that single resistor would be the equivalent resistor.
We will get a permanent resistor and replace these two as a sort of reference to now if we looked here.
The stores and circuit series that covenant was a store will be the summation of each of these registers
that are connected in series.
It is easy to calculate that covenant resistance of resistors in series.
It is a symbol the sum of all the resistance the substructure of above the fair.
The first second and all subsystem resistance or resistance or resistance value are added together.
For example if R1 is 100 ohm and R2 is 201 then the equivalent resistance would be 300 homes.
Other example if our one is 50 on R2 is thinking on then are 3 and all three is a five hundred ORM then
the equivalent resistance for these three resistance will be ten thousand five hundred five hundred
fifty on.
Now let's take a deeper look at this circuit are 1 and are 2.
There is a certain circuit in series on your brutal brutal board or blackboard setup the following circuit
using the resistance value indicated on the next slide.
Calculate the equivalent resistance R E and measure the resistance with your Volt or meter so you need
to provide to connect these two values resistors in the blackboard and calculate the result.
Then you can measure the result using your volt o meter and make sure that you got it right here.
This is a very good example so I suggest that you bought that video calculate the values here and connect
this resistance to Brit ball then write down the values using the Volt on meet up here and compare the
results with the calculated one.
Take five to do this example then return back to this lecture.
Now let's look at the resistors and circuits Bharara.
If there is more than one way for the current to complete its bars that turn on the circuit is better.
So the current one to return from here it will be distributed to here and here then it will take two
ways to return to it.
Beth So these two are connected in better.
Now let's look at the formula.
The left hand formula is really just the same as the right hand formula except it is for tools stores
and butter only.
And the algebra has been done on the right hand formula to make it a little simpler.
We must point out that uh by the very nature of a barrel circuit the equivalence resistance will be
less than any of the single resistors that make up the circuit sensitive the Hogans or you need to be
sensitive to this fact so that as we go through the exercises we need to make sure that our results
all in our results.
They're confident that the store will be less than any of the two separate resistors.
This makes sense if you think about it referring back to the W analogy.
If there is more than one horse for the water to flow through each bath has a relatively narrow hose
which is at a distance then what the water sees as it approached should the whole opening is not the
narrow opening of just one horse as the sum or the total sum of all openings which would make it appear
that there is one large opening to go through one large opening is like seeing one lower resistance
pass a bath then the individual holes opening so that thing that you need to know is this formula works
for biologists thought if there's only two resistance.
This is for more than one batter to the store.
So you need to get this right now let's look at a circuit example.
As you can see here in Europe the big board set up the following circuit using the resistance value
indicating on the next slide calculate that covenant resistance R E and measure the resistance with
your Volt or meter.
This is the circuit.
These are the values.
And please take five to do this.
Example.
Now let's look at this parallel challenge.
Make a circuit with three systems and Belarus and Brother calculate their covalent resistance.
Then measure it.
If we have R1 350 on r tooting K the arm of three four point seven zero or now let's build the circuit
and see um what is the covalent resistance.
Let's look at resistors and circuit mix which means that has these unbearable transistors.
If the best of the best for the current in a portion of the circuit is a single bath and in another
portion of the circuit has multiple routes the circuit is a mix of series and bar circuits are usually
not just series or bar most practices are a combination of the two in order to allow the these mixed
circuits you need to be able to divide sections of the circuit and look at the smaller section individually
then once each segment is analyzed the segments can be put back together to make the whole circuit in
this circuit.
If you look at the two C resistors in the lower left of the circuit here this is a source our end series
the equivalent of these resistors is the symbol some of that all resistance values.
Next the equivalent combined through the store is connected and bonded with the writer of the story
because there are two buffers for electrons going into this portion of the circuit the equivalent of
these two resistors is R1 multiple by R2 divided by R1 plus R2 which is the law that we mentioned in
the slide this one
okay now going back to our slide
finally there is a story at the top is in series with the equivalent resistor here at the bottom because
the count has only one death.
This is a simple matter of how we can simplify the circuit and give the equivalent resistor.
Now if we look to this mixed circuit
okay.
Okay.
If we looked at the circuit as you can see here.
Let's start with relatively simple make circuit and build it using your bread board.
That one value is 330 on are two and three are four point seven.
Care not to point to keto.
Um let's see how we can calculate its value.
If we take these two resistors are two and are three.
This is the low to get the equivalent value of corn equivalent resistance from them since they are in
parallel once we get that value which will be in that case.
Uh one thousand four hundred ninety eight we can go further and sum these two values which are in series
now and give the result which will be three hundred thirty on plus one thousand four hundred ninety
eight on om and the final result will be one thousand nine hundred twenty eight.
Or you can calculate this yourself using calculator or using your opinion Baber and this is a really
simple example to butter and one series let's look another example.
This is our one hour to all three are for this.
These are their values respectively as you can see here we can start by summing are two and all three
were in this as you can see here the equivalent resistor will be three point two kilo and going further
we can r e r r for our in Belgrade so we can calculate their values in this low and the result will
be as you can see here that is that will be two thousand two hundred thirty on since uh the final result
is to have two thousand two hundred thirty ohm uh after accordingly summing the equivalent value of
these two as a source with those and series here this that is a simple example I encourage you to do
it at home using your Ben and Baber.
Thanks for watching.
Next we will discuss arms law.
This is education and joining team.