How to build a simple electric motor, plus how it works.

How to build a simple electric motor, plus how it works.


The Tabletop Explainer episode three: How to build a simple electric
motor, plus how it works. Materials (1) cell and leads (2) tape (3) thin insulated wire (4) Magnets; (5) Cylinder; (6) Scissors;
(7) paperclips, two Now for how it works… The stripped underside of the wire allows
a current to flow through the loop. Since the loop is in a magnetic field, these moving
charges feel forces, as we discussed in the last episode. The charges moving to the right
at the top of the loop feel a push into the screen, while the charges moving to the left
at the bottom of the loop feel a push out of the screen. These forces work to turn the coil. When this
happens the insulated portion of the wire turns as well, blocking the current through
the loop, and eliminating the turning forces. The loop then coast through a full-turn, ending
up where it began, and the whole thing starts over again�

100 Replies to “How to build a simple electric motor, plus how it works.”

  1. At 1:14 the direction of the forces is wrong. With the current setup, the electric current flows from left to right both on top and the botton of the wire. The magnetic field is also in the same approximate direction, so the "Push" would be to the same direction both on the top of the wire and on the botton. The ring rotates because the forces are larger on the botton, because the magnetic field is greater closer to the magnet.

  2. you move too fast

    Q.1 i think you need to insulate half the wire to prevent electron flow in the undesired areas,
    it matters which half way, because you may be insulating the location at the source
    more loops means increased current flow and magnetic field
    to increase the speed of the generator one could add more loops to wire, have a more powerful magnet or replace the battery

  3. of course its conductive, actually its one of the best also, to save money and efficiency companies use aluminum and other cheaper conductors

  4. The direction the current is going in relation to the magnetic field determines the direction of the force applied to the wire. By only stripping part of the wire, you only let the current run through the wire when it is positioned so that the force perpetuates the spinning motion. Otherwise the force would be trying to spin the wire clockwise half the time and counter clockwise the other half of the time.

  5. He only took the insulation off one side of the wire, therefore since the voltage was attached to the paper clips, when the insulated part of the wire was touching, it acted as the commutator.

  6. I think the only part not so clear is that he's shaving off the coating on the wire after he makes it into a coil. The coating should be scratched off on each end of the wire such that if the wire spins on on the paper clip's hoops, the conducting part of the wire is only touching the paperclips half the time so that the current only flows half the time. If you strip the wire it all all the way around, current will flow all the time and the wire will not spin.

  7. I saw that on the "Mr Wizzard show and he used a cork with the wire wound around it. I made one back in 1988 and still have it

  8. why yes as a matter of fact it is how I talk to retards who criticize other peoples videos because they lack the intelligence to figure out simple shit. and no, I'm not scratching my head, I could give a fuck how many people gave iGat a thumbs up, they're just retarded internet trolls as well who can't create or contribute anything meaningful in life other than their negative bullshit comments on peoples videos, and it is these people who I could care less if I offend or not. FUCK TROLLS

  9. isnt it obvious how its built? Dont need 1h explanations, he mentioned the parts and no need to be a genius to see how its constructed …

  10. I try to build it … then let you know, I wanted to ask, but ', you need 4 magnets and you're forced to scrape the copper wire contacts in the rotation … I've already' built one with a neodymium magnet, but does not work, the copper coil does not turn … anyway thanks!

  11. Does it matter if the coil is wrapped around a bit of plastic because I built one wrapping a lot of wire around one side of a thread spool and had another coil on the opposite side, these are running length wise into the middle of the spool. Mine doesn't work so I have to try making then actual electro magnets.

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  15. Something to consider, if the gauge of your coil wire is too light, then the axle will tend to bend and cause the coil to be un-balanced.  This can cause a problem in the demo.

  16. My coil just sviwels back and forth fast and wont turn no matter how good the battery or the coil is made. Can the magnet be to small? I used a speaker and also a stack of neodynium magnets from cd/dvd rom drives but nothing seems to work…

  17. Hi there….great video….can you please explain why you need to remove half of the insulation or enamel to one axle…..only I can't quite hear your explanation in the video!!…..I've seen other videos where both axles are fully stripped of enamel and the coil still rotates ok??….many thanks from Rob in the UK

  18. I don't know about the rest of the commenters, but this video was funkier then it had any right to be, and I'm so glad. I thought the audio levels during the explanation was fine as well. A perfectly good, instructional video.

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