Recent content by hhtat

I've got four Lishen 272 Ah cells I brought from Amy of Luyuan via Alibaba back in 2021. They've only been cycled twice. Also will include a JBD 100A BMS with Bluetooth. Asking $400. Pick up in Austin, TX. Sorry - I can't pack them for shipping.

I've a 120A JBD BMS and wondering if the "lock" to enable charge/discharge can be used to switch on/off a live load / charger? Basically if I've a 100A load or charger - is it fine to use the BMS's "lock" to connect and disconnect? Will that harm the FETs or cause any arc'ing?

My cells finally arrived at my doors. The hardware they came with feels quite weak (M6 bolts instead of set screws + flange nuts). Is there any good place to buy better hardware? I also am looking for more bus bars needed for top balancing. I'm thinking about ordering these...

Where does 142 seconds come from?

They make the assumption that "on" means any none zero voltage across the light bulb's terminals. It takes nanoseconds for the RF/EMF wave + capacitance to cross the 1 meter air gap. It'll take 1 second for DC steady state voltage to reach the bulb and turn in on in the way we understand it...

The technically correct answer is 1m/c which equals 1s. It has nothing to do with length of wire. In fact without wires (no a complete circuit), the technically correct answer is 1m/c b.c he is relying on RF/EMF and capacitance from the switch being flipped. I hate the fact that the...

I'm not seeing any errors in the 3D diagram other than maybe the fact that the magnitudes are not reflected? It's the interpretation of the Poynting vector that is incorrect. The Poynting vector between the wires are non-consequential in DC steady state. Outside of DC, they're called inductance...

Are you talking about the 3D graphic from the original video? It most likely wasn't created that way... Trying to interpret the Poynting vector as something it's not. Consider this example: wrap the entire circuit loop in a perfect shield. Assuming no changing magnetic field... Poynting vector...

The Poynting vector needs to be integrated over a closed surface of a volume in 3D space to be used in the Poynting theorem. Yes there's non-zero Poynting vectors outside the wires and yes there shouldn't be any vectors inside the wire (assuming ideal conductors, etc). But I don't know what you...

True but they're using Poynting vector for something it doesn't describe. It's not a breakdown of that model. It's a misuse.

I also want to mention that the video did a qualitative analysis of energy flow instead of a quantitative one. In the other words, that 3D diagram reflects direction of the fields and the Poynting vector with no analysis of the magnitudes. They then go on to suggest that majority of energy flows...

Maybe "physical process" isn't the term I'm looking for. I think what I'm trying to say is energy flow in itself isn't a physical process but a measure of the change in a quantitative property caused by physical process if that makes any more sense. You're correct energy is a quantitative...

That's exactly what they're trying to imply. Being correct on a technicality means you've to dive into minute details of the argument which is the opposite of simplifying assumptions. I bet those there professors of EE would have serious problems with the final video... There's a bunch of...

Veritasium is known to be the click-bait of science and does a lot of pseudoscience-like logic in other videos so I would take this video was a truckload of salt. Honestly, he just discovered RF & maybe capacitance. The whole water flowing through pipes analogy still holds.

If you add two more switches to the circuit at opposite ends where the wire bends - and open those two switches half a second before you flip the main switch - you'll still see some RF (+ maybe capacitance?) induced voltage at the bulb even thought the circuit is incomplete. Again, I find this...