Net als in de vorige blog gaat het 'slechts' over het thema elektriciteit. En ja: ons denken wordt daardoor totaal overhoop geworpen. Maar hetzelfde geldt eveneens voor al hetgeen we over 'spirituele aangelegenheden' denken te weten.
"Mensen kunnen het liegen niet laten," beweerde Gurdjieff. Nu heb ik het niet over wat mensen over zichzelf denken, maar over hetgeen ze soms uitkramen. Eigenlijk zouden ze eerlijk aan zichzelf moeten kunnen toegeven dat ze in wezen niets weten. Ze zouden moeten kunnen inzien dat al hetgeen ze 'denken te weten' ooit gehaald werd uit boeken en uit dingen die ze van anderen hebben gehoord of van buiten hebben geleerd. Maar zelf weten ze niets.
Ik ga er nu niet dieper op ingaan en er dan ook geen 'spirituele thema's' bij betrekken. Wel doet de mens er goed aan zijn eigen denken en het zogenaamde 'weten' in vraag te stellen. Ooit al eens de vraag: "Wie of wat ben ik?" gesteld. En, wat weet je, bijvoorbeeld, over elektriciteit?... Echt weten, bedoel ik - niet: denken te weten. In elk geval wat er je ook over denkt: het is totaal verkeerd. :-)
Hieronder kan je een andere uitleg over elektriciteit aanhoren...
0:00 How does alternating-current even work if charges never go anywhere the answer to this question rearranged all my intuitions about circuits prepare for a mind blow.
0:12 This episode was made possible by generous supporters on patreon.
0:16 Hey crazies.
0:17 One thing you cannot do is confuse the motion of charge with the motion of energy.
0:23 They are not the same thing.
0:24 Let's define them both very carefully electric current or just current for short is the flow of positive charge.
0:31 Wait, wait, wait positive charge.
0:34 Yeah, you can think Ben Franklin for that too.
0:37 The timeline back in 1748 Ben Franklin stated two things about electricity one ampere becomes negative when rubbed and two current is the flow of positive charge then a hundred and fifty years later JJ Thompson discovered the electron and we realized we had a problem you'd think we would have adjusted one of Franklin's definitions, but we didn't we doubled down on them instead even though we know negative charge is what moves in a current we pretend like it's positive charge moving in the opposite direction human stubbornness will never cease to amaze me.
1:12 Anyway, we have to live with it.
1:14 Now electric current is the flow of positive charge and we measure it in amperes or amps for short the energy flow on the other hand is best described by something like power that's basically how fast the energy is being used and its measured in joules per second watts Giorgi for what anyway current and power are related to each other since current is charged over time and voltage is energy per charge power is just current times voltage.
1:42 It's a relatively easy calculation, but our original question isn't really about amounts.
1:47 It's about direction this equation tells us nothing about direction but isn't the energy carried along by charged particles, what won't the current and the power be in the same direction?
1:58 Well, yes to the first question but no to the second the charged particles do have energy because well everything has energy but that's not the energy that's powering whatever device trees.
2:11 Let's say for the sake of simplicity.
2:12 It's just an incandescent lightbulb.
2:15 What I'm about to explain will be true of everything but we don't want to get caught up in unimportant details on the same note.
2:22 Let's how our that light fall using a simple battery the positive end has a higher energy than the negative end.
2:28 So if you give the charge as a path, they'll fall to the lower energy.
2:32 That's what an electric current is over time.
2:35 We know the energy in a battery goes down as we use our devices it can cause sheer panic when it's the battery in our phones.
But this same thing happens with the light bulb - the energy in the battery goes down as the light bulb emits heat and light the flow of that energy is described by something called the pointing vector.
2:54 No, that's not a typo.
2:56 It's named after John Henry pointing the guy who came up with it.
3:00 It is a pun though because it points in the direction of energy flow.
3:04 I love puns.
3:05 Anyway, here's the pointing vector E is the electric field B is the magnetic field and mu is just the constant to make the unit's come out right?
3:14 Don't worry about that too much that gives us the energy flowing through an area every second a common use of this vector is with light light is an electromagnetic wave a disturbance in electric and magnetic fields that results in a flow of energy from a ball that looks something like this but the pointing vector is true for any electric and magnetic fields.
3:35 Not just the ones you find in light.
3:37 What's the deal with those fields again?
3:40 I guess I could do a cookie review charges affect the electric field and moving charges affect.
3:46 The magnetic field.
3:47 These fields are not attached to the charge.
3:49 They stay attached to space while the charge moves.
3:53 If no charges are around the fields are still there.
3:56 They're just zero a similar thing happens around a battery.
3:59 This battery can be thought of as two equal but opposite charges those charges will affect the electric field but according to the pointing vector, we don't get an energy flow without also having a magnetic field the battery isn't going to lose energy just sitting there.
4:16 It has to be connected to something.
4:18 Here's the electric field around the battery again drawn a little simpler if we connect some wires and a light bulb that feel will distort a little even though the charge and that extra stuff is balanced.
4:28 It still channels the field through itself.
4:31 The field in those materials is strong enough to push the charge along now that there's a closed loop the electric field will cause a steady current and where there's moving charge.
4:40 There's a magnetic field.
4:41 So now we have an electric field and a magnetic field according to the pointing vector we get an energy flow but this cross-product means the flow has to be perpendicular to both fields.
4:53 The flow of charge is the same direction as the electric field which can't be the same as the flow of energy according to pointing the energy cannot flow in the same direction as the charge.
5:04 Wait what exactly when I realize this it broke all my intuitions about circuits, but here's what everything looked like when I put it all back together if we zoom in and one of the wires a little we've got a strong electric field inside moving the current along and a little electric field outside.
5:21 We also have a magnetic field inside and outside using the pointing vector.
5:26 We get an energy flow toward the center of the wire the energy comes from the field outside the wire wait, didn't you say earlier that the energy comes from the battery?
5:36 Yeah, but but it happens indirectly inside the battery the electric field points the opposite way, but the magnetic field points the same way if we look at the battery the same way we did the wire the energy flows out of the battery and into the field.
5:51 So the energy the wires and light bulb gain from the field is the same amount of energy that the battery loses to the field the energy flow in this circuit looks like this.
6:03 It's cray-cray.
6:04 It doesn't even matter.
6:06 If it's AC or DC with alternating current or AC the current just moves back and forth because the electric field keeps switching direction, but so does the magnetic field if this changes direction and so does this the two effects cancel the energy flow maintains its direction even in an AC circuit, the energy flow is out of the source and into the devices.
6:28 How can that possibly be our AC generators like miles away?
6:33 Yeah, but but that's a totally fine.
6:35 Remember these fields are everywhere and affected by all charges everywhere the energy coming out of a power source doesn't have to be the same energy going into your devices conservation of energy just says they have to be the same amount.
6:49 If you calculate the amount of energy flow across the surface of this wire, you will get exactly what you'd expect for the power loss to heat in light.
6:58 So how does the energy actually flow in a circuit the energy that makes a circuit work comes from the fields around them a source of energy like a battery just replenishes what gets used and all the electric current does is provide the mechanism.
7:12 We need to make the energy flow.
7:17 Sorry you as mind-blowing as me right now, please share in the comments.
7:21 Thanks for liking and sharing this video.
7:23 Don't forget to subscribe if you'd like to keep up with us and until next time remember, it's okay to be a little crazy.
7:30 The featured comment comes from spaces where we belong to who asked is when just a little nudge to get the coil spinning.
7:36 No, no what we're not making perpetual motion machines the induced current actually resists the motion of the coil.
7:43 So without the continued push from the wind the coil almost immediately stops.
7:47 Anyway, thanks for watching.
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