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The ampere (symbol: A) is the SI unit of electric current[1] and is one of the seven[2] SI base units. It is named after André-Marie Ampère (17751836), French mathematician and physicist, considered the father of electrodynamics. In practice, its name is often shortened to amp. In practical terms, the ampere is a measure of the amount of electric charge passing a point per unit time. Around 6.241 × 1018 electrons passing a given point each second constitutes one ampere.[3] If you want to describe this wiggling about, this vibration of electrons, this back and forth motion as flow then go right ahead. You are probably the only one doing so but why should it matter to me. The real flow that should be discussed is the flow of that wave. No Simply_q is not the only one... More than likely all the Electricians and Linemen around the world call it current flow. ANSI, IEEE, NEC, UL, CSA, call it current flow. Fuses are rated in amps. Motor data plates give the FLA (Full Load Amps) of a motor. Clamp an Amprobe around a current carrying conductor, it measures the flow of AC current in amps... Whoever started using the term alternating current to describe what we are talking about was an idiot. The only thing that is really important here is the movement of the electromagnetic wave from source to load.And from the load back to the source. A closed circuit, current flow... Ohms Law... E = I x R.... If we know E and we know R then we can find I. I? How much current is flowing in a closed circuit. |
Jea, I'm sorry I didn't explain myself well enough as you have completely missed my point. If you take the time to read and think about my last few posts you will see my point has nothing to do with fuses or motor plates or amp clamps or anything like that. It only has to do with the fact that "flow of alternating current" makes no literal sense. Of course there is this convention that we describe what is happening with that phrase. We also say that the sun rises in the east and moves across the sky when any educated person knows it is actually the earth that is moving. We're stuck with it and I will continue to use it since everyone understands what we are talking about, but using the term flowing to describe something that is moving back and forth in a periodic way is only done in AC. It is a misnomer. Yes, I know my position flies in the face of conventional wisdom and I'll be labeled a booger eating moron for bringing it up but if you dig around you will find others who find fault with the phrase. I do understand the backlash though since from the first day you were sitting in a class about AC the instructors used that phrase. That doesn't make it technically correct. I don't know how else to explain myself. I would just ask you to give it some thought. Now, to this matter. Me..... The only thing that is really important here is the movement of the electromagnetic wave from source to load. The movement of the EM wave is not current. The energy in the wave is absorbed by the load and converted into some other form of energy such as heat or light or if the load is an antenna it is radiated off into space. It does not flow back to the source. . |
Herman If you take the time to read and think about my last few posts you will see my point has nothing to do with fuses or motor plates or amp clamps or anything like that. It only has to do with the fact that "flow of alternating current" makes no literal sense. But it does. I attempted to explain in a post yesterday, but it would seem the moderators took some issue with it and it was never posted. If this post is allowed, perhaps I'll try to explain again. The movement of the EM wave is not current. No, but it is the consequence of current. The magnetic field portion of the EM wave is entirely the result of the current flowing in the wire. |
Yea, I hate it when my posts get deleted for seemingly no reason. I would be happy to entertain your rebuttal but my mind is pretty much made up :>) I'm sticking with the idea that flow means something moving in one direction. I also believe you are backward regarding the relationship of EM wave and current. I also don't accept that you can talk about the M without the E. They are intertwined and inseparable.. Since the wave can travel without current it is illogical to conclude that the wave is caused by the current the current. EM radio waves can travel down a wire but they can also travel from the transmitter to your radio no problem, no current. When that radio wave intersects your receiving antenna it sets the charges in motion, not the charges setting the wave in motion. It appears we are at an impasse. You seem like an inquisitive sort. It would be interesting to see how you felt about all of this after you have had time to digest it all, and vice versa. . . |
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