*engineering.
Someone's coupled something in serial - the light is (also) coupled in serial with maybe several other outlets - causing even higher voltages, and causing the light to go on when the hair dryer circuit connects.

I don't see that there is anything he could have done wrong that would cause that behavior. The only wrong thing he could do that would still result in the light shining is to reverse the hot and neutral (assuming all he did was swap the fan for the light). That's a very, very bad thing to do, but wouldn't cause this in an otherwise correct circuit. I don't think anyways. I'd have to resort to drawing pictures to figure it out.

This is probably a good thing because it means he discovered a potentially dangerous problem in the previous circuit. There's lots of ways you can wire up two switches a light and a GFI socket that appear to work but are actually dangerous mistakes of varying degrees.

ed: My suspicion is that the whole circuit is wired to a different breaker on each end, which is a mistake I've seen more than once in the few years I did this stuff and a giant pain in the ass, not to mention dangerous... though he would be lucky not to discover that while changing the light, unless he just turned off all the breakers or something.

I think every man has at least one cousin like that.

(At least with his sense of humor, he'll probably do quite well in the dating circuit).

It seems like a serious movie, but it's called Chappie and comes across as an action remake of Short Circuit. It looks good but maybe I'll wait for reviews!

You do realize the whole idea is that this is... technically... one continuous take? They add in another iteration every time she makes a circuit.

Video version of singing in the round...

Comment hidden because you are ignoring dag. (show it anyway)

Obviously crossed wires, we'll just need to recambulate the oxidisation circuits.

The shadow could be solved with 2 bracelets projecting, one from the wrist, one from below the elbow, or maybe even just 2 projectors on the wrist separated enough to compensate for finger shadows. Now we just need a miniature terminator power cell and a few years of miniaturization of cell phone circuits and we're there! ;-)

I'm going to assume that this is the Lorentz force, because it's the principle that involves magnetic and electric fields. But there are setups that can use subtleties of magnetic and electric fields, it can be very complicated. Any physicist rather than astronomer might be able to explain this better... or spot subtleties.

If you notice, it only starts moving once the back magnet has touched the wire. Which i think means that the wire is used to carry the current from the battery, with the magnets providing the magnetic field for the Lorentz force to drive the train. Effectively the force is felt by the electrons travelling in the wire (F = q(E + v x B), x being vector product, cross product), but there is an equal and opposite force to be felt by the 'train'; so it travels along. If you watch, it does look like the wire is responding - i'm pretty sure the small track would have shot off to the right if he hadn't held it, and it moves as the train approaches in the longer track.

So, circuit is set up by the the wire contacting between battery terminals, current flows in a circular fashion (mostly, assuming adjacent loops don't short). Magnetic field will emanate out from the battery on average radially, i assume (this is a simplification but a reasonably safe one), so the resulting cross product - and therefore direction of the force - acts along the remaining perpendicular direction to those, ie. straight up or down the loop depending on which terminal is leading.

If you want to see how that works, you can use the right hand rule. First finger is the direction of the electron's velocity (which is traversing loops so constantly changing in a circular manner), middle finger the direction of magnetic field which always comes out radially from the middle of the coil or track, thumb F the resultant force always points along the loop - make your first finger point in all directions of a circle, keep your middle finger pointing radially out relative to your first finger, and you will notice your thumb always points the same way, no matter how v changes circularly.

It is reasonable to assume that other factors are involved, probably a current is induced into the coil as the battery moves - the battery carries a magnetic field cos of the magnets, so we then have a moving/changing magnetic field in the presence of a wire; it should induce a current which would create a magnetic field in opposition to the field of the magnets.. and so on. But i think the Lorentz force is what provides most of the motion.

Very neat idea!

If you replaced the magnets with a non-magnetic material conductively glued onto the magnet, it would still work. From wikipedia on 'electromechanical solenoid',

Electromechanical solenoids consist of an electromagnetically inductive coil, wound around a movable steel or iron slug (termed the armature). The coil is shaped such that the armature can be moved in and out of the center, altering the coil's inductance and thereby becoming an electromagnet. The armature is used to provide a mechanical force to some mechanism (such as controlling a pneumatic valve). Although typically weak over anything but very short distances, solenoids may be controlled directly by a controller circuit, and thus have very quick reaction times.
The force applied to the armature is proportional to the change in inductance of the coil with respect to the change in position of the armature, and the current flowing through the coil (see Faraday's law of induction). The force applied to the armature will always move the armature in a direction that increases the coil's inductance.

Now that I have had a chance to compare the Arrows F1 vid to the other ones from 2012 (and it does say at the start that the one I posted is from 2012... oops) there are other 2001 Arrows A22 out there, I found one of several owned by the Woodcock Brothers and driven by Michael Woodcock at Monza (http://youtu.be/VVBuTMCpIeE). It does have different liverie to this one though, with Woodcock on the side. They did once manage to get two cars going and had two Woodcock brothers in a Boss event at Hockenheim.

Even better though, I found another vid of this car at Zolder, and the info on that vid says:

model: Arrows A22
production year: 2001
driver: Arnold Wagner (GER)
engine: Asiatech 3.0l V10
chassis: A22 - 07
track: Circuit Zolder
date: 2012-08-16

Pictures
http://belgian-motorsport.com/

Both Nico Rosberg and Lewis Hamilton broke the pole lap record for the Interlagos circuit of Brazil this year with the new hybrid engines. Previously held by the good man Rubens Barichello so I doubt that made them very popular with the locals! The race lap record is still held by Montoya.

In our local HD, I figure they exist to stop people from filling $25 item boxes with $175 circuit breakers. They haven't a clue about anything else.

If you used recycled circuit boards, your floor could end up cheaper than your board.

After the PoV Pod racing, I'm becoming a fan of the drone racing circuit.

Robot movies seem to always be about them becoming aware, self-concious, or alive... I know Asimov had a great influence on this trend but still, is the lemon not pressed enough? Star Trek (Data),Bladerunner, Robocop, Wall-E, Alien(s), A.I., Stepford Wives, D.A.R.Y.L., and personal favorite : Short circuit. And now this one. All the same re-invention of the Pinocchio archetype, if one may say.