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Joined 2 years ago
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Cake day: June 6th, 2024

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  • Are radiowaves also electromagnetic fields

    Radiowaves are a color of light that we can’t see. Technically “light” typically only refers to visible colors, and we call everything else “electromagnetic radiation”. Radio waves, microwaves, and infrared light are past the red end of the rainbow, while ultraviolet, x-rays, and gamma rays are past the violet end of the rainbow. All of these are self-propagating ripples in electromagnetic fields.

    whether we actually consume or use the electrons themselves or simply reap the biproducts of some kind of manipulation that we do with them

    It’s very difficult to actually destroy an electron. When I said the electrons are “depleted” in a transistor I meant they are pushed somewhere else. Electrons can be pushed and pulled by electromagnetic fields, so in a transistor one current makes a field that pushes electrons out of the region where they would need to be for the other current to use them.

    In all cases it’s the electromagnetic fields that actually do the work.

    If you want to know about electrons actually being destroyed, an electron will annihilate with a positron (antimatter electron) releasing some gamma rays. There are some medical applications for radioactive material that produces positrons which annihilate to produce gamma rays in this way, and then they can detect the gamma rays.


  • This is a reasonable description of heating elements and incandescent lightbulbs.

    Microphones, generators, speakers, and motors typically involve an electromagnet and a permanent magnet. For speakers and motors, electrons moving in a circle generates a magnetic field, which pushes against the permanent magnetic field of the permanent magnet. For microphones, and generators, it’s kinda the opposite: a permanent magnet moving near a coil of wire generates a magnetic field.

    Transistors, which are the basis of modern CPUs, rely on the need for loose electrons to be around for an electric current to flow. In a carefully crafted setup, you can end up with a current flowing along one path depleting the loose electrons needed for a flow along another path to form. This creates a kind of “electric switch”.

    Heat is generated in all of these processes, but it’s generally an unwanted but unavoidable byproduct, similar to heat produced by friction in a mechanical system.

    I’m not sure what you mean by “EFFECTS of electron flow” vs “electricity”.

    What tends to matter is the electromagnetic fields and how they change. Often we use electrons flowing in a piece of metal because they are easily influenced by electromagnetic fields, but also when there is an electron flow in a wire, the shape of that wire can result in different electromagnetic fields. However, I think it’s worth mentioning that electrons and wires are just convenient for controlling the electromagnetic force. It’s possible to have electromagnetic effects without either (for example, lightning and static electricity are electromagnetic effects that don’t involve conductors, and light is an electromagnetic effect that doesn’t rely on electrons).

    I’m happy to answer more questions, I’m trying not to launch into a whole physics lecture lol but I sure can if you like.