Electromagnetism

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Instructions for constructing and electromagnet and an investigation of magnets and the relationship between electricity and magnetism.

Category:

Science & Technology

Tags:

• magnets
• electricity
• electromagnet
• Oerstedt
• Electronics

[silverbull]

I have a question and it would be great if some one could answer it, if some one already asked it sorry I didnt see it. What I am wondering is that why doesnt the circut overload as there is no load in the circut to convert the energy into something else. If some one could answer this it would be great.

[ScienceOnline]

The 1.5 volt alkaline AA battery has an internal resistance, this combined with the resistance (very small) in 5 meters of 28 gauge wire reduces the current flow so the coil does not overheat. A battery with a lower internal resistance or higher voltage would cause the coil to get too hot.

[PhotographersAcademy]

That looks very much like a short circuit. I think you would flatten the battery very quickly. It would be safer to add a 1.5 volt light bulb in series to keep the circuit safe.

[ScienceOnline]

As mentioned in the video this electromagnet must use a 1.5 volt AA battery, even with this small battery the coil will get very warm. A bulb in series would probably reduce the strength of the magnet considerably.

[WhiteMorphageus]

thanks man; i always wondered which way the current flowed from a wire!; but can u tell me if this statement of mine is correct: "the north pole(of the electromagnet)lacks electrons(positively charged)."; thanks so much!

[ScienceOnline]

Electrons are responsible for magnetism but the physics is complex and involves electron "spin".

[Trivialnights]

really good video. Thank you for putting this up. Really appreciate it.

[mortenrobinson]

BTW all, there is no such thing as a real short circuit. All electrical conductors will have some resistance. A very small resistance such as this copper-wire just means that a lot of current will run. This will result in more heat being generated. Another important fact when working with electricity is that the hotter a conducting material becomes the more resistance it will get. So "shortcircuiting" a battery will cause higher internal resistance in the battery and more resistance in the wire

[comfortablynumbb]

if opposites attract, why is the north needle of a compass attracted towards the north pole of earth and not the other way around?

[techneon]

wait a second.. at 8:07 wouldnt the compass be the south and the other be the north? Because the compass attracts to the opposite? The red end (which finds north) would have have to be south because it attracts to the north. If im wrong please someone explain?

[twhouser]

silverbull : the electricity is induced into the nail and becomes electromagnetism, if two insulated wires are wrapped on the nail you have made a transformer and the electromagnetism is reinduced and becomes electricity again,at this point the nail is no longer a magnet it's potential being disipated

[BogMonkey53]

is the wire wrapped around the nail insulated? I can't see how this would work with uninsulated wire. Wouldn't the current flow through the nail itself?

[TheOldred101]

That's correct. The earth's north pole is actually the magnetic south pole.

[sector1037]

QUESTION:If the "north part" of the magnet is attracted towards the earth's north pole does it mean that the "north part" is actually the south part? opposite attracts and same repel right?or the north pole of the earth is actually the south?

[Lonlywolf89]

very nice video....

few other facts:

there are elctro magnets, permenants magnets and time magnets (lose power as longer time goes)

and also the world has an electric-magnetic "stipes" going from south to north and those stripes are attracting the needle of the compus not the north pole

[Maticus2009]

The magnetic cloud takes some time to dissipate.

[SKH93]

The nail made frm hard magentic material. Hard magnetic material is more difficult to get magnetised but if you connect the circuit long enough for it to be magnetised then it will retain its magnestism even if the circuit is broken. Hence the nail is able to attract the paper clip. Steel is an example of a hard magnetic material.