What is inside a hair dryer? (2 of 2) | Electrical engineering | Khan Academy

[@vincentmercier8595]

Those 2 rubbers pieces are designed for 2 things, to prevent the hairdryer from slidding down a table with the cord weight and help prevent side scratching on paint.

[@WTG194]

thanks for the video. Quick question, how is the voltage reduced when you run the fan on cool?

[@mashy712]

the cool button is a switch to the coils which electricity would run though. Pushing the cool button pushes away the connection to the coils.

[@shvideo1]

Excellent educational video. Thank you for explaining each component in detail. I learned a lot.

[@jessicag630]

Please make a "What is inside a paper sheet music box" video someday. That would be interesting.

[@Doom2pro]

The thermal fuse is not usually there to prevent the air from getting too hot, it's there in case of a fan failure (partial or complete) which would prevent heat from exiting the coil area and cause the coils to heat up much higher than they are supposed to (possibly even to incandescence, or glowing red) which would cause a fire and or burn hazard.

[@KStewart-th4sk]

Or if the intake screen were plugged. So many people don't take the cover off and clean the screen.

[@alexandr0id]

I wish you mentioned which wire goes into the motor and which one into the switch - neutral or hot, isn't that another safety feature? (also, how does the "cool air" button work - doesn't that remove the heating coil from the circuit - how the fan will get the voltage down in that case?)

[@bestestinventions7032]

this is pure quality! love the detailed explanations! thank you so much!

[@khanhtruong4448]

Thank you for giving detailed information. Very easy to understand.

[@NeroForte_]

best presentation ever.

[@paulvitti666]

Congratulations my friend! You have explain it so well! Thank you so much!

[@TheJaimeLong]

I was wondering if you could take a part a d demonstrate the differences in between a normal hair dryer and an ionic dryer as well as an infrared hair dryer. I am always wondering which one to buy. I like to look at the mechanisms in the dryers as well. What you are doing is awesome! Thanks for the info!

[@cynthiajordan5631]

+TheJaimeLong Same here. I'd like to know what the Ions actually do, and why it's supposed to be better for your hair.

[@joseantonioyepez9746]

Thanks, very detailed explanation

[@userhighlight7736]

Very informative video, thank you. How could I safely disengage the heat so I just have the hairdryer blowing cold on all settings?

[@BlueyMcPhluey]

fascinating teardown

[@macmohanku]

Is there any way to remove heat element from the dryer?

[@Bohmartistry]

Woah this is awesome

[@gianasalaita2244]

Great Video, Thank you!

[@rostamk8635]

How can I order a new replacement switch for this model? The existing switch is stuck.

[@MrSingh369]

I wanna make something like this at my place. This is gonna help me a lot. Thank you. ❤

[@Michael-dv3ij]

If i cut the wires going to the heater, would the motor be affected or would it just blow cold air? Or would I have to forcefully bend the bimetallic strip in order to get cold air?

[@youtubeguy3544]

Ok we get it man two things come together to make a mold

[@hanshocubu]

this is very informative. Tks Khan Academy !

[@Doom2pro]

That diode in the coil not part of the motor bridge rect. is a cheaper way of implementing a half power setting, which would normally be created by a separate smaller coil, or a tap off the main coil. It works by half-wave rectifying the AC so it only gets power every half cycle as opposed to every cycle which limits the average power consumed to half of normal usage. This is a messy way of implementing half power mode because it causes noise in the mains and a net DC current draw from mains.

[@fractalnomics]

The air is first radiated and then (force) convected away (with the fan), right?

[@yoga2345656]

Thank you, nice presentation. I have been designing a few type of more powerful fan propulsion.

[@tfsishuba1369]

What type of switch is dat one , i hear you said it varies the speed can u explain more how it accomplish dat

[@leonardocabrera1327]

I´ll give you a 10 in explaining :D

[@theloneprobe843]

how does the motor receive the right voltage once the thermic valve is bended by excessive heat?

[@ryanmccarthy2033]

I like your vids, good job

[@Mingaling3]

Where's video for taking apart the motor????? I need it

[@giorsoros1135]

How do you make sure the bimetallic strip not conduct any electricity so it doesn't short ?

[@Doom2pro]

Make sure you disconnect the main heating element and not the secondary heating element which is used to drop the mains voltage to 12-20 volts for the motor to run! If you disconnect this element, or it's supply (if it's coming from the main coil) the motor won't get any power!

[@Murlockingqc]

Why would you disconnect any of the 2?

[@Mr_Tezs]

what holds nicrome wire..??? please let me know its regarding my project

[@zuckirosenfuchs5441]

Nice video!!!

[@FixDaily]

Great explanation :)

[@malusnarischkakov]

What is the white (or at least lighter colored) string-like material that's wrapped around the mica with the nichrome coil?

[@theredeyejedi]

Right? So that white us a heat resistant sting that is ran through a smaller awg coil that is used for and is made of...idk

[@debitaylor7866]

Mohan Kumar did you ever get a answer to your question about, can I remove the heater from the hair dryer? I just want it to blow cold air.

[@oldscoolgaming.5040]

If you know how to solder you could just take the power cord out of the dryer,solder the wires from the output of the switch onto the motor,solder some more wires from the input of the switch to a socket for a power adaptor to suit the voltage of your motor ,hot glue the socket into the hole where the old wires came out and there you go.or if you want you can just cut the end from the power adaptor and solder them onto the switch if you can't get a socket.

[@zhekai7586]

love the great explanation!!! thank you so much!!

[@-3clypxe-222]

Hello,would you like to diy et dryer?please.

[@cvanpatten6641]

How easy is it NOT to have the heat function? Would they have to redesign the entire blow dryer to only have cool air?

[@naturallygifted2002]

Do you know what makes it blow hot air, and what can you do to make it hotter?

[@saarike]

Nice explanation, that gives chances to even fix the dryer with help of dmm. :)

[@coalsauce4457]

will it still work with the nichrome wire taken out or will the excessive current destroy the fan motor?

[@keynonketcher1525]

Chris Qiao if you remove the nichrome then you need step down transformer to reduce the voltage compatable with the motor..in this case 12v

[@deveshyadav2519]

how much temp we can genrate in nichrome coil ,which type of turbine(more speed ) is good for hair dryer, n how much volt bettry is requird for differnt nicrome coil .... plzz say me the parameter

[@bodeine454]

Our Conair 1875 hair dryer started to spit small sparks out of the air outlet end of the dryer. I am suspecting that the electrical contact points that he describes is the culprit. I took the dryer apart and the contact points are no longer true, flat and flush with each other. It appears that the points erroded at their edges causing a small gap that I suspect current is jumping across, causing the sparks. I'm thinking that if I can file/sand the points flat again that it will fix this issue but there's not a lot of material there to remove. I don't want to remove too much that it causes other unwanted issues but I'm curious to see if this fixes it. I think I'll try to search for replacement contact points and maybe just replace them but I'm betting that that's a long shot ! Anyone have any ideas?

[@ghostnaughty9894]

hey i wanna knw that how the fan drives the air from the back(where heating takes place)?

[@asdf3668]

my hair dryer broke, so i decided to take it apart and watch this

[@surajvernekar5514]

Which 4diode use in hair dryer fan motor tell me please

[@dusterdude238]

I have a pretty old Con-air Hairdryer that went out today. I did continuity tests with a volt-ohm meter. checked the plug, switches, motor and Heater coils. and everything checked out there. then I tested the thermal cutout and it was OK. then the thermal fuse. No go! . so that's the end of that. I'll part this one out and get a new one. it would be easier rather then trying to replace the thermal fuse.

[@bilgaissa5831]

Is the motor 220 v dc

[@lostinmyspace4910]

Of the two screws on the back handle f my Pro Beauty by Interteck the top screw will loosen but it is stripped and won't come out. Prying the handle apart and it appears it's glued. Cheap hairdryers come apart easily as this video shows but the expensive hairdryers have other tricks that prevent it from coming apart...glue, etc., but my issue is the screw that appears stripped. But it lasted more than 10 years.

[@karlkarlng]

its not the using the coil as a resitor to drop the voltage. it is using it as a divider

[@doprisi]

Is it maikish sheet? Mikish sheet? Cant find it on google. The stuff that protects the plastic from getting soft..

[@dusterdude238]

Mica

[@doprisi]

Thanks a lot man :) I took a toaster apart and build a small heating element for a project inspired by the vid

[@MrVinh11]

please tell me how to remove the fan because I want to replace the motor. Thanks

[@TonyStark-fn2zt]

How much hair dryer rpm does it have? please reply thanks.

[@marysmith7637]

I NEED HELP. DO YOU HAVE A VIDEO ON A REMINGTON MINI BLOW DRYER. MY SWITCH SPRING IS BROKEN AND I CAN'T GET THE CASE OFF BECAUSEVIT HAS TO FACINGS THAT BLOCK THE COVER FROM COMING OFF. ONE IS AROUND THE NOZZLE WHERE THE HOT AIR COMES OUT AT AND THE VENT ON THE BACK OF THE TOP PART. I CANT GET EITHER ONE OFF. I'M ON FACEBOOK WITH A LONG BLONDE PONY TAIL

[@lytnin88]

The heating element is used to drop down the voltage for use in the fan. But what if you have cool air selected? The heating element will then be off, so how can it supply voltage to the fan?

[@Murlockingqc]

If you look inside an hairdryer, or this video, you will see there's actually 2 size of coils. I believe the smaller one is for dropping the voltage. If you push the cold air button, you get colder air but you can still feel some heat coming through, the fan blow most of the heat away that's why it feels cold. He doesn't explain how the switches work, the secondary fire hazard safety devices and how the cold air button work :( I wish he did because he explain the rest really well.

[@enuno673]

The bimetallic strip your referring to is actually called a resettable thermal switch....

[@shaikhameed8847]

En Uno : can the resettable thermal switch be repaired.

[@msmliang867]

my hair dryer shut down because it's too hot. how can i fix the broken dryer or I should just buy a new one ?

[@shahidilhan3139]

Msm Liang try replacing the thermo fuse

[@khimoalemen7997]

can i just get rid of the heater thing?

[@TheArtOfKP]

Where can I get the mica sheet

[@jaewok5G]

i love the information, but in 2 parts it's about 3/4 about the gfi and various 'plastic injection moldings'. how about doing a pim video and refer to it, a gfi video and refer to it and spend 5 min actually talking about the hair dryer?

[@surajvernekar5514]

How can make hair dryer coil pls tell me sir

[@bhaskarnavasare4793]

How does the electric current gets converted from across to dc from switch

[@Murlockingqc]

He explain everything in the video... the heater is a BIG RESISTOR, it reduce the voltage to 12V and the 4 diodes around the motor make the current only flow in one direction, AC = flow in both direction / DC = flow in one direction. The switch does NOT transform the current from AC to DC. The switch can handle high voltage current, don't replace with a lower voltage one or you might risk electrocution or you will blow the switch.

[@fatimajaan4604]

My hair dryer fan is coming out when i on the hair dryer why?

[@surajvernekar5514]

How can do hair dryer machine coil in home

[@Genghiskaran]

great

[@raziyagoodnmkhan5568]

I have also open and take out the motor of the hair dryer

[@NautilusTSG]

bi metalic strip , the one expands faster ? this is not correct. it expands more but not faster.

[@NautilusTSG]

Ni-Chrom wire? not necessary, it could be also Kanthal wire... with aluminium instead of Nickel..

[@tokochitadze8759]

can i get a nichrome wire from hairdryer heater??????

[@karidhacker3196]

Yes

[@cevtongoodon1667]

What's cause the the hair dryer to work for four minute on stop

[@telosfd]

Hi maybe is that he said at 9:04 clean the air filter this is the main fault.

[@memecenter9443]

plsss answer can i use this nichrome wire for vaping

[@TheFerIuxia2]

Yes

[@inductor1.77]

cool vid, subbed

[@vikramkhanna9515]

hairdryer me moter kitne volt ki use ki jati h

[@viewer4468]

Aha! probably I can use hair dryer to blow up dust from window screen, I would just disconnect the heating element so that it will consume less current. Thanks! mwah!

[@barryhadar4486]

Can you fix a blow dry

[@devendraoswal4368]

bhai mujhe us me ki nichrome wire chahie plz help

[@zeltau]

I don't even know khan academy makes these videos

[@mireknovacek9680]

I dont understand, how somebody can buy so low quality products.. Its the lowest quality hair dryer, I have ever seen.

[@vikramasokan1653]

I saw here for making jet engine

[@snarlingrabiddog5150]

Chrome rusts.

[@surajvernekar5514]

My old hair dryer coil is not working what can do?

[@julianslab1511]

Photonicinduction if he watched this video: what a waste of a flamethrower *:-/*

[@southmigo6541]

Why he saying all this unessaserry shit

[@technicalediting5831]

Bhai 1 muje he de deta

[@fatimajaan4604]

Plzzz help me

[@ovidius2000]

👎useless