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AC and DC power: Voltage Lesson 2 of 2
This video discusses the difference between AC and DC power supplies including batteries, wall outlets, and voltaic cells. This is the second video of a broader discussion about voltage. The video also makes use of computer simulations created by: PhET Interactive Simulations University of Colorado phet.colorado.edu.
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Second the where does the e- go question – Yes the positive end can “fill up” and that is a dead battery. The potential is maintained by chemical reactions (at least in a battery) so when an e- arrives at the (+) terminal, a chemical species is “reduced”? and becomes some new variation of its former self. That effectively gets that new e- out of the way so that the potential can be maintained.
Hope that helps!
First the AC question – an AC generator has a spinning coil of wire in a fixed magnetic field. If that is all you had, you would just generate a DC style current, but the clever thing someone did was to rig the system so that every half rotation the spinning coil switches between two? sets of leads. One set would send the DC in one direction, the other set of leads sends the DC in the opposite direction. If the coil spins at 60 Hz, then the AC potential is at 60 Hz too.
Ok. I think I understand everything you explained. But I’m still not grasping what’s causing AC current to go back and forth. I? understand the potential difference in direct current causing the electrons to move from one terminal to the other to “balance itself” which even that I’d like to ask what exactly happens to the electrons that finally get to the positive end and redistribute themselves? does the positive end “fill up” so to speak? What keeps them unbalanced and that potential intact?
Thanks very much, that clears up ac voltage had been bugging me? for a long time!
Yes 50Hz? at 240 Volts over here in the UK
LOL don’t? do that in the uk we have diffrant types of plugs, and you will end up with curly hair
HAH! In theory that may be true? as long as you trust your electrician. In practice, you may be better off learning to juggle.
So, if i wanted to impress my friends, ? I could stick something metal in the bottom or left hole of the outlet?
Great lessons sir…?
your vids helped a great deal, truly appreciate it?
thank you so much.?
Also @JTGkeeno, the neutral and ground are both essentially a hunk of grounded wire. The circuit is only closed when you have something plugged in connecting the? live to the neutral. The device that is plugged in will always have some resistance to keep electron flow under control. Without resistance the circuit would “short” and rapidly (too rapidly to be safe) try to bring the live and the neutral to the same electric potential. Hope that helps, I’m not sure I answered your question!
A voltmeter needs to be set? to either DC or AC measurements. I believe the AC voltage reading is actually a root-mean-square (RMS) style of averaging that effectively flips the negative part of the waveform to a positive (from the “square” part). The averaging comes out to about 115V so it is fair to say I simplified the situation. In the US we often use 230V (RMS) AC circuits for large appliances like ovens and electric dryers. This may be similar to what you have in Australia?
Great video i have 2 questions though. (Australian Voltage is 240) If an AC circuit alternates between +240 and -240 how come when tested with a multimetre it will only show a steady reading of 240? Also why does Neutral show zero? voltage if there is 240v at the power terminal and it is a closed circuit?
(part 2) When you stack two batteries in series, the (+) side of the bottom? battery will immediately go to the same charge level (electric potential) as the (-) side of the top battery (any two touching conductors do this). In this configuration, an electron that leaves one battery ends up going into the other battery (+) terminal and they trade electrons. Because each battery has to maintain a 1.5V push, they create a combined push that acts like one big 3V battery. Hope that helps.
(part 1) A battery can not just give elections to something else without getting an electron right back, otherwise it would start to build up charge. That is why you couldn’t light a light bulb by connecting a wire from the negative terminal of one battery to the positive terminal of a different battery. All a single battery can? do is push an election from its negative terminal to its positive terminal, and the amount of push is the 1.5V.