Electrical Engineering For Dummies

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Electromagentic spectrum question..?

Right I am trying to get my head around the EM spectrum and how electrical waves are different from light waves.

Say I used a signal generator to make an electrical signal of a certain frequency that signal is a flow of electrons right? but then where does that fit into the EM spectrum which is all waves of photons and not electrons?

I need someone to give me a rough physics for dummies class in this. I am a trainee electrical engineer but recently I have been reading physics and now trying to look at the EM waves from an electronic point of view... I dunno its late and I am confused.

Thanks If anyone can help.
Right so I think I may have this but I am probably totally wrong.

Ok, so electons flowing through wire, accellerating to hit the next electron and current flows. When the each electron moves from its orbit a photon is released in the form of EM radiation?

I'm trying!

Light waves are EM waves. All the different names for EM waves all are the same "stuff". We name them based on how they manifest in to human experience and technology. The essential difference is the frequency, which gives an EM wave its "color".

Suppose you use a signal generator to make an oscillating flow of electrons. Out of the generator, an electromagnetic wave will be created. Will it be light? Likely not, but it will be the same "stuff" as light. Most likely, it will be a radio wave, because of the technology limitations of how you produced it.

EM waves are classified as the following. Remember, these are all the same stuff and the essential difference is the frequency. They are named based on how they interact with human experience.
Radio waves
Micro waves
Infrared rays
Visible light
Ultraviolet rays
X-rays
Gamma rays

So, those electrons in your transmitter...do they ever leave the transmitter? No. All the electrons in the transmitter do is disturb the nearby electric and magnetic fields nearby in a repeating pattern. We speak of photons, because there is a minimum amount of energy you can carry by any frequency of electromagnetic wave, and that in some instances EM waves have a dual nature of behaving like particles. We named the particles photons.

So what happens in transmission is that the electrons in the transmitter disturb the neighboring E/M fields. By disturbing the fields, photons are produced, which travel through the space, as an alternate model for electromagnet waves. The radio receiver antenna on the other side of transmission will senses the EM field disturbances carried by photons, and the disturbances are absorbed by its electrons to produce its internal electric signals.

Thevenin Theorem Analysis of Electrical Circuits


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