I like how anti-science dipshits try to derail the thread because they can't even address the most basic aspects of the science in this so they just resort to trying to demonize intelligent thought in general, seeming to think that hides their personal deficiencies, but too dumb to realize it actually just highlights it instead.
He had some other great videos on things that people seemed to believe they knew how it operated (including how often people measuring the speed of light has been flawed) only to find out things were not that simple or the logic being used doesn't hold up to scrutiny. Sometimes the basic belief does but the logic for why doesn't. Kinda like how growing up I remember there being assumptions about how water reacts (stuff like hot water freezes faster) that are based on flawed assumptions of other aspects (i.e. if you throw a pot of boiling water into the air when its below freezing causing an immediate change). The water one has led to some intense studying (experiments) about it that is pretty interesting.
It also highlights how there's a lot of very low level science that we still don't thoroughly understand. Which is why anti-science people get mad and try to demonize science in general as though that's a bug and not a feature, because it hurts their pathetic weak minds to unlearn something or learn that their gospel could have ever been wrong.
He had some other great videos on things that people seemed to believe they knew how it operated (including how often people measuring the speed of light has been flawed) only to find out things were not that simple or the logic being used doesn't hold up to scrutiny. Sometimes the basic belief does but the logic for why doesn't. Kinda like how growing up I remember there being assumptions about how water reacts (stuff like hot water freezes faster) that are based on flawed assumptions of other aspects (i.e. if you throw a pot of boiling water into the air when its below freezing causing an immediate change). The water one has led to some intense studying (experiments) about it that is pretty interesting.
It also highlights how there's a lot of very low level science that we still don't thoroughly understand. Which is why anti-science people get mad and try to demonize science in general as though that's a bug and not a feature, because it hurts their pathetic weak minds to unlearn something or learn that their gospel could have ever been wrong.
This is a funny topic, because it reveals a) how immature humans are, in that we introduce ego into everything, and b) how approximations are applicable depending on your frame of reference.
Things like measuring speed of light are a good example in that there's a 'back of the napkin' model that's close enough to reality to be usable, then the 'technically/ackshewally' answer that's usually a *lot* more complex. That's where the ego comes in, where certain peoples decide they cannot possibly be wrong about something they held to be true for a very long time (old tradesmen are horrible about this) and so arguments start up over shit like how heavy a pound is and how electromagnetism actually works, etc.
The person holding the bulb isn’t tied to ground. Plus those voltages are probably pretty low.
William Gaatjes
Lifer
- May 11, 2008
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I think, we should see this similar to a transmissionline description and velocity factor. That wire still has inductance and when the switch switches on, the voltage will rise from 0V to battery level Vy. This will take time from t = 0 to t+x. During that time, a changing voltage is present and therefore a changing current. Dielectric constants and all that stuff will start to happen. Time domain reflection measurements are common. And this seems to fall in such a situation. Just see the lamp as bad impedance or proper impedance depending on the resistance of the lamp and the electrical characteristics of the cable like impedance. Therefore, light only moves at the speed of light in vacuum : c = 300 000 km /s. But electrical signals also. But in conductive materials also surrounded by non conductive materials but with dielectric behavior the speed of the electric signal is much lower than the speed of light. Hence the velocity factor correction calculation. So the statement is to be called : "special".
And from the hyperphysics site it is known that electrons flow at a low rate from one end of the wire to the other when dc current is applied. Think milliseconds to seconds. Depending on the length.
Velocity Factor in Cables
"
In theory, electrical signals move at the speed of light. Cables only slow them down. The ratio of actual speed to the speed of light is known as the velocity factor, or Velocity of Propagation (VOP), expressed as a percentage of the speed of light in free space.
This slowing effect is almost entirely caused by the dielectric material; in coaxial cables, the insulation between the shield and the center conductor. For a closed-cell foam dielectric, for example, the VOP may approach 90%, meaning that a signal will travel at 90% of the speed of light. For solid Teflon®, the VOP is typically about 70%.
"
Excerpt :"
A TDR sends a low voltage pulse into the cable under test and at any impedance change within the cable a reflection will be seen. The TDR measures the time between release and return of the low voltage pulse from any reflections. By measuring the time and knowing the propagation velocity of the pulse, the distance to the reflection can be calculated. This helps to give a user information on the type of impedance change or failure that could be present in the cable.
The below image shows a typical set-up for a TDR measurement. A parallel path of two conductors is required to see a reflection graph of a pulse traveling along a cable. Therefore, one of the leads of the TDR is connected to one phase of the cable and the other lead is connected to the cable sheath, which is also connected to ground. The reflection of the pulse is caused by the change of impedance between those two paths and every interruption, change of impedance, or cable end is indicated. The low voltage pulse travels through the cable and is reflected positively at the cable end or at any cable interruption (cable cut). At a short circuit point this low voltage impulse is reflected negatively. A change of the impedance in the cable, such as with a joint, will be displayed as a laid S.
"
The Basics of Time Domain Reflectometry (TDR) - HV Technologies
Understand the basics of Time Domain Reflectometry (TDR). Learn how TDR works to locate faults and assess cable integrity effectively.
www.hvtechnologies.com
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