swiftscout8
Active Member
87 messages
joined Apr 2007
Kate Diaz 👍
What exactly is EM radiation? It’s simply any combination of electric and magnetic fields. There is always a source behind it. But that isn't really the point here—the real question everyone asks is whether EM radiation is actually harmful. If you ask me, most scientists approach this specific question with far more caution than is actually necessary.
Theoretically, we already know certain types of radiation are harmful. However, we’re still stuck in this endless loop of testing and statistical trials, all just to prove that this damage falls within what they call "normal" limits. That’s exactly where we stand today with cell phones.
Once again, we’re seeing theoretical proofs claiming radiation isn't harmful, yet they spend all their energy desperately hunting for evidence to prove otherwise.
Every wire emits radiation. You have electric and magnetic fields at play here. The electric field is a consequence of voltage, while the magnetic field stems from the current. With direct current, the electric field moves along the conductor, which means you're dealing with a magnetic field that can actually be measured outside the wire.
Alternating current creates an electric field that can—and absolutely will—extend beyond the conductor. When you pair that with a magnetic field, you're looking at electromagnetic radiation. It’s worth digging into this if you want to understand what's actually driving the skin effect.
How much radiation are we actually talking about here? It’s not a simple number. It all comes down to frequency and current.
This means the cord on your nightlight is emitting radiation too, but you haven't bothered to worry about it because the levels are so negligible they aren't even worth a debate. We’re talking about 50Hz systems here, which is exactly what that substation under discussion uses. So, what's the actual difference between a wire powering a nightlight and a transformer station? It comes down to the load—the current—not the voltage. That 30kV external voltage just tells you the substation covers a larger area, meaning it carries a much heavier load than anything on a low-voltage grid. Even though it’s a closed electrical system, the EM radiation from a substation like that is significantly stronger than what you'd get from a low-voltage unit.
So, should we actually be worried about this kind of radiation? If you want an answer, you just have to look at the nature of electromagnetic radiation itself. EM radiation functions in two distinct ways. The photoelectric effect introduced the world to the particle nature of EM radiation. It directly describes certain phenomena that occur during interaction (just look up the photoelectric effect). The energy of an EM quantum increases alongside its frequency. Simply put: higher frequency means higher quantum energy. Take the photoelectric effect as an example: light is used to eject an electron from a Zinc atom. What frequency range are we talking about for that light? We’re looking at the THz range. Meanwhile, here we are discussing 50Hz. Just compare the frequencies and the quantum energy levels of these two types of EM radiation and see for yourself.
So, it turns out light still isn't actually harmful to the human body. We’ve evolved our own built-in defenses against that kind of radiation.
It’s worth looking at two distinct scenarios here: one where we have a confirmed case that could actually be harmful, versus the situation you're describing.
Think about a covalent bond. It’s what holds two non-metal atoms together by sharing an electron. Now, imagine you hit that molecule with radiation intense enough to knock out that specific shared electron. At that exact moment, the molecule ceases to exist. Apply that same logic to DNA. It is quite literally the worst-case scenario.
There’s another, more straightforward scenario where a quick burst of EM radiation disrupts an atom. If you look at the Bohr model, you can see how a single quantum can nudge an electron from one shell to the next. The ionization case—where the electron is kicked completely out of the valence shell—is just a specific, extreme version of this. Because the atom is now in an unnatural, agitated state, it naturally tries to stabilize itself. It wants that electron back in its original position. Eventually, the electron settles back down, but in that process, it releases energy in the form of heat. Of course, it isn't quite that simple. To get the full picture, you really need to dive into materials physics. But there’s your explanation for microwaves and cell phone radiation.
At the end of the day, we’re talking about an electromagnetic quantum that actually possesses enough energy to trigger a reaction. Everything else is just noise; it doesn't affect matter at all. If a quantum lacks the necessary energy, the atom isn't even going to receive it. It’s the same basic principle as a key trying to fit into a lock.
So, what exactly makes something harmful? It’s the radio waves. If you crank up the current frequency and open up a conductor—essentially turning it into an antenna—you end up radiating electromagnetic waves. We know this because we can use shortwave frequencies to communicate with another continent. That proves these emissions are powerful enough to impact the surrounding environment. At frequencies between 3-30 MHz, a mere 100W of effective radiated power (ERP) is enough to send a signal from the US all the way to Australia. That’s unsettling. Yet, somehow, it’s still considered "insufficient" to be deemed harmful. Of course, at higher power levels, the same thing happens.
When we talk about cell phones, we’re looking at frequencies in the 1GHz-3GHz range, with power outputs measured in milliwatts. Harmful? It's certainly much more intense than a transformer station running at 50Hz. And yet, people carry these devices just centimeters away from their brains while they're running at full capacity. We are *still* investigating the actual risks of these devices. But hey, big business needs to keep making money, right?
There. A little scientific perspective on the transformer station issue.😁 Critiques are welcome.😁
