Ohm's law

We'll show you how you can use a simple Arduino Nano to decode CW and using a flashing LED to send a message.

We'll also have a workbench to encourage hands-on learning with a multimeter and voltage dividers to learn about Ohm's Law in a practical way.

Our aim is to not only show amateur radio at work, but to encourage guides and scouts to learn from the experience.

If you have any other great JOTA activities you can suggest, email us at education at ddrci.org.au and we'll see if we can add those to our agenda.

Any other mechanics that think about doing a channel, yeah, make your video universal because you don't know who's watching.

It could be some 18-year-old aspiring and mechanic that need to know Ohm's Law.

And that's the basics of basics from electrical.

But if I mention Ohm's Law and mechanics, some mechanics don't even know what the hell.

How does that help me fix a car? I don't know.

It's just something you need to know.

The electrons rush out of the negative end, flow counterclockwise through the wire and the bulb, and pour into the positive end to satisfy the chemical demand and restore the balance.

And the physical mechanics of that flow through the circuit are governed by the single most critical mathematical formula in this entire section of the book, Ohm's Law.

If you are taking any foundational exam in computer architecture or basic electronics, you must possess an intuitive, unshakable mastery of Ohm's Law.

It definitively outlines the relationship between the three fundamental properties of electricity.

I always try to visualize abstract physics.

The smaller or skinnier the pipe, the greater the physical resistance to the flow of water.

Resistance is measured in ohms, named after the German physicist Georg Simon Ohm, who authored the foundational law.

So if we synthesize those three properties, Ohm's Law states I equals E divided by R.

is the universities still have not adopted a field-based philosophy other than a very few universities.

Most of them still are stuck in the traditional circuit-based approach where Ohm's Law rules and energy travels in circles.

So that's something that I want to challenge both managers and engineers alike.

You have no excuse.

And if you've ever taken a ohm reading on a compressor from winding to winding, you'll notice they have very low ohm readings, like sometimes one, two, three, four, in that range for a lot of compressors we work on.

And if you work Ohm's Law, you'll be like, "Man, these things should be drawing, like, I don't know, hundreds of amps." Well, yeah, and that's because they do if they're just purely resistive.

Once they start spinning and you start to get those inductive forces, which just means magnetic, so once those magnetic fields start expanding and collapsing and counteracting that incoming force, that provides that resistance, and that's what we call inductive reactance.

It's another, if you wanna combine it all together, that's Z. That's your impedance.

Sometimes if I have a patient lying on a hospital bed and I need a diagnosis right away, that's life-saving.

But do I really understand how to be a good clinician, how to be a good thinker, a good architect, a good engineer, if I don't understand Ohm's Law properly? You know, it's the basics

that are important.

You mentioned Euler or Euler's constant E. You're talking about Ohm's law.

You're giving me sort of like flashbacks to my struggles in

undergrad.

Right.

To understand high voltage injuries, you really have to apply basic physics, specifically Ohm’s Law to human anatomy.

Okay.

Walk me through that.

When a patient is trapped in a house fire, the thermal injury to the lungs themselves below the vocal cords is almost never caused by the direct heat of the flames.

Really? Because you'd think in hanging fire would burn the lungs.

The physics of the airway prevent it.

The human upper airway is an incredibly efficient heat exchanger.