Class 12 Exam > Class 12 Videos > L21 : Bulb in series & parallel - Electric Circuits, Physics, Class 12
L21 : Bulb in series & parallel - Electric Circuits, Physics, Class 12 Video Lecture
FAQs on L21 : Bulb in series & parallel - Electric Circuits, Physics, Class 12 Video Lecture
| 1. What is the difference between bulbs in series and bulbs in parallel? |  |
Ans. When bulbs are connected in series, they are connected end-to-end, so the same current flows through each bulb. However, the total resistance of the circuit increases, resulting in dimmer bulbs. On the other hand, when bulbs are connected in parallel, each bulb is connected to the same voltage source, so they have the same brightness. The total resistance of the circuit decreases, allowing more current to flow.
| 2. How does the brightness of bulbs change when connected in series? | |
Ans. When bulbs are connected in series, the brightness of each bulb decreases compared to when they are connected individually. This is because the total resistance of the circuit increases when bulbs are connected in series. As a result, less current flows through each bulb, leading to a dimmer glow.
| 3. What happens if one bulb in a series circuit stops working? | |
Ans. In a series circuit, if one bulb stops working, the entire circuit will be interrupted, and all the bulbs will go out. This is because the same current flows through each bulb, and if one bulb breaks or becomes faulty, it creates an open circuit, preventing the flow of current to the other bulbs.
| 4. How does the brightness of bulbs change when connected in parallel? | |
Ans. When bulbs are connected in parallel, the brightness of each bulb remains the same as when they are connected individually. This is because each bulb is connected to the same voltage source, allowing the same current to flow through each bulb. As a result, the bulbs maintain their brightness.
| 5. Can bulbs of different wattages be connected in series or parallel? | |
Ans. It is not recommended to connect bulbs of different wattages in series. This is because bulbs with different wattages have different resistances, and when connected in series, the total resistance of the circuit will vary for each bulb. On the other hand, bulbs of different wattages can be connected in parallel, as each bulb will receive the same voltage, and the different wattages will not affect the functioning of the other bulbs.
Text Transcript from Video
20 hello friends this video on electric
circuits part 21 is brought to you by
exam feel calm no more fear from exam
please make sure that you have watched
all the videos to the part 20 before
going ahead with this what is fashion
which we will see is verbs arranged in
series vs. verbs arranged in parallel
let us suppose you have two buds which
are arranged in a circuit in series
combination and the same two bulbs are
arranged in a circuit in parallel
combination then you switch on the
circuit that means when the when the key
is pressed that is the circuit is closed
the bulb glows do you see any difference
between these two circuits yes you do
the bulbs which are arranged in the
parallel circuit they are brighter than
the bulbs which are arranged in series
circuit why is it so when bulbs are
arranged in series they become dimmer as
compared to the bulbs which are arranged
in parallel combination so why does this
happen this that is because the
brightness of a bulb is basically
determined by the power of the circuit
so the brightness brightness is
dependent on power and what is power
power is given by v square by r right
where V is the voltage that is the
potential difference and R is the
resistance of the circuit so let us
suppose that in these cases let us
suppose the EMF of the battery is the
same for both the cases so what will
happen in this parallel combination in
the parallel combination the potential
difference across this will be 10 volts
similarly the potential difference
across this one will again be 10 volts
right but what will happen in the series
combination the potential difference
between these point will be 5 foot
and the potential difference between
these points will again be fivefold so
the potential difference across each
bulb will reduce so when I talk about
series combination the voltage decreases
the voltage across each bulb decreases
and what happens to the resistance in
case of series combination the
resistance what will what happens to the
equivalent resistance here
here they're equivalent resistances r1
plus r2 and what happens here
here the length let us suppose that both
the bulbs have the same resistance
I let us suppose they have same
resistances I so here the equivalent
resistance becomes 2 I what happens to
the equivalent resistance here it is r1
r2 divided by r1 plus r2
so here the equivalent resistance
becomes R by 2 so that means in series
combination the voltage decreases and
the resistance increases whereas in case
of parallel combination the voltage
increases whereas the resistance
decreases now power if you look at it is
directly proportional to voltage and
inversely proportional to resistance so
if voltage is more and resistance is
less then power will be more therefore
in this case power is more whereas in
this case the power is less therefore it
is dimmer and this is brighter so the
bulbs arranged in parallel glows
brighter right thank you please visit
exam vo comm to watch free educational
videos try 3 online tests get the best
quality study materials study from the
best tutors and mentors and much more
thank you once again
circuits part 21 is brought to you by
exam feel calm no more fear from exam
please make sure that you have watched
all the videos to the part 20 before
going ahead with this what is fashion
which we will see is verbs arranged in
series vs. verbs arranged in parallel
let us suppose you have two buds which
are arranged in a circuit in series
combination and the same two bulbs are
arranged in a circuit in parallel
combination then you switch on the
circuit that means when the when the key
is pressed that is the circuit is closed
the bulb glows do you see any difference
between these two circuits yes you do
the bulbs which are arranged in the
parallel circuit they are brighter than
the bulbs which are arranged in series
circuit why is it so when bulbs are
arranged in series they become dimmer as
compared to the bulbs which are arranged
in parallel combination so why does this
happen this that is because the
brightness of a bulb is basically
determined by the power of the circuit
so the brightness brightness is
dependent on power and what is power
power is given by v square by r right
where V is the voltage that is the
potential difference and R is the
resistance of the circuit so let us
suppose that in these cases let us
suppose the EMF of the battery is the
same for both the cases so what will
happen in this parallel combination in
the parallel combination the potential
difference across this will be 10 volts
similarly the potential difference
across this one will again be 10 volts
right but what will happen in the series
combination the potential difference
between these point will be 5 foot
and the potential difference between
these points will again be fivefold so
the potential difference across each
bulb will reduce so when I talk about
series combination the voltage decreases
the voltage across each bulb decreases
and what happens to the resistance in
case of series combination the
resistance what will what happens to the
equivalent resistance here
here they're equivalent resistances r1
plus r2 and what happens here
here the length let us suppose that both
the bulbs have the same resistance
I let us suppose they have same
resistances I so here the equivalent
resistance becomes 2 I what happens to
the equivalent resistance here it is r1
r2 divided by r1 plus r2
so here the equivalent resistance
becomes R by 2 so that means in series
combination the voltage decreases and
the resistance increases whereas in case
of parallel combination the voltage
increases whereas the resistance
decreases now power if you look at it is
directly proportional to voltage and
inversely proportional to resistance so
if voltage is more and resistance is
less then power will be more therefore
in this case power is more whereas in
this case the power is less therefore it
is dimmer and this is brighter so the
bulbs arranged in parallel glows
brighter right thank you please visit
exam vo comm to watch free educational
videos try 3 online tests get the best
quality study materials study from the
best tutors and mentors and much more
thank you once again
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About this Video
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Nov 19, 2024 Last updated |
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