Inductor - Sixty Symbols

[freemanx2x]

We know that two parallel wires that carries current will attract each other if the currents are in the same direction and repel if the currents are in opposite direction...So why we still represent the magnetic field as would some iron pilling organise around a magnet bar when we know that the magnet bar and each particle of iron can be substituted with a coil? And every time these "imaginary" coils would attract the sides where the currents in the coils have the same direction...

[HWGuyEG]

"Giant coil in here"

lol low pressure steam turbines, the coil is in the shortest chamber on the end, a long smaller chamber would likely be high pressure turbines

[Eembu]

i am sure if I wrap around a lot more wires on one side of the transformer, I could take out someone with a single battery. But that is only one person since it's only an AA bat. Next vid, how atom bomb works, please : )

[nowhereusa]

@Eembu well a stun gun runs on a 9V battery or a few CR123's

[Aviatorsmith]

@Eembu Nope. You can shock someone with it, but it will be a very minor one.

[Serpico261]

@Eembu i once tried this. you can take a normal transformator, then if you connect an alternating voltage of about 3 volts or less on the primary side (the side that you plug into the house plug) i got about 130 V output. But it is important that you vary the frequency of the primary input so it resonates with the coil, than you have a maximum voltage output. You can create very high voltages at home with such simple set ups.

The coil winding ratio from both sides determine the output voltage

[Eembu]

@Serpico261 That is good to know that you have to resonate. I am not good at electronics but I do know a little bit. Someday tho I'll be an expert :)

[jombo567]

How not to explain s'thing

[Probewitch]

Thank you for the mention of Joseph Henry, an important figure to often overlooked.



[subfrostedzero]

i learnt this in school, interesting stuff

[orgminyak]

1:05 Isn't that a short circuit?

[bradajr]

@orgminyak yes it is... but that was demonstration with low voltage for magnetic field around wire

[orgminyak]

@bradajr in school, we tried to make a short circuit with 2 1.5v battery. In seconds, the insulator started smoking and melted

[bradajr]

@orgminyak yeah that was just a regular ''straight'' wire... and it is a short circuit

but when you make an inductor ( spin that wire around something like a pencil) it will make an electrical induction ( an electromagenic field will appear around it) and it is not a short...

and yes it is short circuit but for an such a short time so that it wasnt started to melt

it probably started to heat but it is thicker wire so it take a longer time to start to melt...

[puncheex]

@orgminyak: A neat experiment (and a cautionary tale). Take a small amount of steel wool and stretch is out into a thin long wad about four or five inches long. Using a heavy pair of gloves, wrap that around a plain AA battery. You'll find that the battery has easily enough voltage to cause enough current through the iron wool to cause the iron to burn. It is just that easy to start a fire with a mere 1.5 volts. (This has nothing to do with induction, just resistance.)

[puncheex]

@orgminyak: No. The inductor (coil) acts like a resistance, first because it is a long copper wire and really does have plain old resistance that resists any voltage, but beyond that, when coiled, it also resists *change* of voltage in the wire. So, while the voltage is climbing when he touches the battery top, the coil is a resistor, except that rather than turning power into heat, it is actually storing power into the magnetic field. ...

[puncheex]

... When the voltage is steady, the resistance of the coil goes down to just what the resistance in the wire is. When the voltage drops, that stored magnetic field collapses and induces a reverse voltage onto the wire. The total effect is that the coil acts to retard changes in voltage with respect to the current.

[LFZ15]

I like playing, coz it's just *fun*! hahaha

[HiAdrian]

2:11 gotta love the brits xD

[MrCletushowell]

Does anyone know how tesla droped resistance of air thats the key i think parallel

Bifilar reverse wound my opinion

[tels2006]

Nonsense, its black magic!!!

[MarxCreations]

Volts go down, amps go up, watts are the total power, ohms are the resistance in the wire, and it all leads up t one thing, how high you jump when you let go... ^_^

[painxtreme]

@MarxCreations 'tis the Amperes that will kill ye.

[desiredusername]

I think this guy is the best of the Sixty Symbols guys. Most human seeming but also I love his lab.

[archaedemos]

cool contact plate doo hicky

[TehSmeely]

I am Intregued to know more about that extra voltage he said was being generated, didnt catch the name

[LinkStrikesBack]

Not watched the video through yet, but it's probably e.m.f. (Electromotive force).

If you move a magnet through a coil of wire, it will produce an e.m.f, proportional to the speed of the magnet passing through the coil, the field strength of the magnet, and the area it is being passed through.

[bliss314159]

while da batterie is attached to the coil a current flow through the coil generating a magnetic field and storing energy in it. When the batterie is detached the current should stop imidiatly. But it cant because of the magnetic field still storing energy. So the electrons are still driven to the end of the coil building up huge voltage. you can think of the ends of the cable as a very small capacitor.

[mundayP22]

The voltage is the induced back EMF caused when the battery voltage is removed from the primary. The reason for it is that inductors can store energy like a capacitor. When the battery is removed the current is virtually instantaneously 0A. The equation V(t)=L.dI(t)/dt change in voltage with time= inductance * the change in current with time. means that the voltage must change and hence the back EMF. The lamp in the video is a neon discharge lamp, which lights up at around 90V minimum

[jestertru]

It's "back emf" which is nothing magical (or energy violating). It comes from self (L) and mutual inductance (M) of the transformer coils. The math is V = L (dI/dt). When he puts the iron bar into it effectively increases the primary L (it's a combo of 4 diff variables in reality: L(primary), L(secondary), M(transformer) and Z(meter), but assuming linearity allows you to reduce it to 1 variable). The dI/dt of shorting/breaking a circuit is a large over a short period of time.

[HLSDK]

Dear god jackson, we've hit saturation! At least I guess it was saturating

[metainfinity]

SO THEN WHAT'S AN INDUCTOR?

He basically went on some tangent about electromagnets and transformers.

[DidntKnowWhatToPut1]

'metainfinity'

a coil of wire...

[bugblood1978]

Its the coil of wire. He`s just showing what practical use it can have. Wikipedia it if you like their good on things like this.

[puncheex]

@metainfinity: It is a coil. It has the property that it resists changes in voltage by using power to build up a magnetic field while voltage is climbing, and then adding that power back into the circuit when the voltage falls, because the field collapses. When used in pairs (a transformer), it has the ability to transform a voltage up or down (with mirror transformation of the current to keep power constant), but only when the voltage is changing. That is why we mainly use AC power.

[jordanmjk0]

cheese is good

[TeamVacaville]

I still barely know what inductors are. Magnetism, coils, voltage, etc. What do inductors do? am I confusing this with Induction?

[DeoMachina]

I think I have one of those old radios lying around. The resistors in it don't resemble modern resistors at all. At first I thought they were wires in glass tubes but it's probably plastic. Also it says Ford on the front.

[cristoirf2]

What are the coils made of, copper?

[cookiecamp]

yeah loads of schools used to use iron filings on there own without them being in a translusent box or anything but they used to get into people eyes

[nolongerlong]

also when they got stuck to the magnets, they were a pain in the arse to get off.

[Woad25]

I've always wanted to make one of those visual aids to help you see the magnetic field around a magnet. Anybody know what's inside? Is it mineral oil? Regular water??

[ricardjorg]

it wasn't as fluid as water.. it was probably mineral oil

[Woad25]

Yea I didn't think water would work, that would get dirty real quick with the iron shavings I think.

[2szymi]

check wbeaty's channel on YT. he shown how to do that

[Woad25]

Ahh found it. Thanks a lot! :)

[DidntKnowWhatToPut1]

'Woad25'

you may as well use an old TV

[bherkert]

lol @ the admission of getting a jolt!

[5dArK5sOuL5]

Greate it is good to know :D!

[MatthewIsAwesomeFTW]

FTW