Domestic circuit connection & fuse - Domestic circuit (Part 2) | Physics | Khan Academy

Let's explore how the domestic circuits are connected (whether in series or parallel). Also, let's learn how the fuse helps protect the domestic circuits from voltage surges. This helps us explore why we have two separate circuits, one for low power devices (with 5A fuse) and one for high power devices (with 15 A fuse).

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Created by Mahesh Shenoy

[shraddhagupta]

I watched the recorded video and it was helpful.
Ans of home work question-
1. In our house we have parallel circuit connection because in parallel connection all the appliances get same voltage⚡️ as that of supply line as well as the overall resistance of rhe household circuit gets reduced and even high power rating appliances can work properly.

2. We use a fuse as a safety device. It is used to safeguard our electic domestic circuit. It is connected in series with the circuit. Two important properties that a fuse wire must have are-
A very high resistance, this because it has to resist the flow of extra current than the prescribed specified amount in the circuit.
A low melting point, this is because it follows Joule law of heating and has to break the circuit when current exceeds specified value.


3. We need to maintain 2 separate circuits one for low power devices and one for high power devices because the current drawn by both of them are of different in magnitude. And in order to safeguard our domestic circuit we need separate circuit for low power rating and high power rating devices.

4. Bonus question ans-
The fuse is always connected to the live wire not with the neutral wire because we know the current in circuit entres from live wire and leaves from neutral wire and the live wire has 220 volts but neutral wire is ground and has potential of 0 volts. So if we would have connected the fuse in neutral wire then it still would have not proved to be helpful in any case because the devices connected can still draw current though then via live wire for a certain amount of time. This would damage the appliances.
Therefore, fuse are connected in live / active wires not neutral.

Thankyou. 🙏🙏

[sudhirgour]

That's what we can call a perfect explanation for this topic. Thanks a lot sir. I wish all schools and colleges had teachers like you.

[ketaki]

the fuse is always connected to the active wire because, if it is connected to the neutral wire, and suppose the circuit disconnects, then the devices will STILL have connection to the power sources for a brief amount of time, and they will still be able to draw some current, and this can damage the devices. whereas, if in the same case, if the fuse is connected to the active wire, then when the circuit breaks, the devices will NOT have connection to the power source and they will not be able to draw current.
is it correct? lol
anyways, thanks for all of your videos, they are very helpful!

[finntechnologies]

I wonder why Khan Academy is underrated! Why?

[sandeepkumar-ztbv]

Thanks a lot sir for your deedful explanation . It was really mind blowing explanations . so thanks a lot again

[rishav]

Aur aaj tak kabhi maine kisi video pe Aisa comment nahi kiya...
But, , I"LL just say today... The way you explained is Awesome 🙂 I just got everything...

[michaelferto]

....Comparing is a good way for clarification.... The Indian electrical system is great, for understanding the American electrical for sharing this video....It would be great if all major electrical systems were clarified, in any kind of lesson for a better comprehensive understanding... As is the case with all kinds of

[nameizmeet]

Finally Understand It.. 🙏🏻🙏🏻💯
These are some basic things which every person should know, but our books doesn't have this much practical approach

[geetugupta]

It was a life changer when I discovered this wonderful channel... You're my fav phy teacher after aanand srinivas :P sir

[manjulakalyan]

Excellent explanation!
So easy to understand
Very very clear.
God bless!

[allenmano]

THIS IS THE DEFINITION OF UNDERSTANDABLE

[mikeangelmusic]

Very good teacher. You give solid yet simplified and easy to understand answers to your WHY questions. Interesting and very informative. Thank you.

[devrathkumar]

Helping me to understand basics idea which is very important

[vivekroy]

Reason why the fuse is connected to the live wire :
Because if we connect fuse to the neutral wire and in case of high voltage supply, the fuse would melt. But the potential difference would still exists across the device(i.e. potentiality at live wire would be more than +/-220v and potentiality at neutral wire would be 0v) so the current still flows and the device might be destroyed.

And if we connect the fuse to the live wire, and during high voltage supply the fuse melts and the potential difference across the device will be the same(i.e. 0v potentiality in both the wiers) so the current would not flow and the device is safe


Please reply if I am right 🙏

[findingmyself]

1.Parallel bcoz the appliances are independent of other appliances.
Also, the equivalent resistance in parallel is less, & also The same voltage is applied to all appliances

2.Fuse is basically a wire (made from alloy of( Pb + Sn) , whose main function is to Melt when high current Passes through the circuit. It's conditions are
- it should have high resistance so that it can oppose the incoming current
- it should have low m. p. So that it can easily melt!

Fuses & Switches are present in contact with live wire as when the circuit breaks, the appliances is not connected to high potential.. While, if we connect it through neutral wire, the appliances is still connected to high potential... Hence a person could get Shock.

PS- new here.. And literally found this channel amazing <3 :)

[Jobanpreetkaur]

Awesome explanation i am sure it must have taken a lot from tour side to make such a animated circuit.... A big thanks for your efforts🫶🏻

[sarwarhossainhridoy]

It's super clear to me right now.
Thanks for video

[nomorephysicsfear]

Perfect explanation sir.
We are expecting lot of videos from you.👏👏👏

[ratnasur]

the fuse is never connected to the neutral wire just because if due to high terminal voltage or short circuit or even overloading of current in the circuit excess current flows through the neutral wire, the temperature of the fuse increases and upon reaching its melting point, it blows off and current immediately stops flowing into the circuit, but, here comes the trick, the live wire still remains connected to the appliance and as we know the live wire is connected to the main point of high potential supply(also called mains), and thus current still flows into it and any person touching the faulty appliance will get as u said sir, a nasty shock 😁😁, btw your teaching is too superb, hope i could touch your feet someday

[thinktalk]

Teaching is better than schools. Practical learning is the best