Comments by "GH1618" (@GH-oi2jf) on "Electrical Current Explained - AC DC, fuses, circuit breakers, multimeter, GFCI, ampere" video.

  1.  @aniawo5119  — Electric charge, a fundamental property of some atomic particles. Opposite charges attract; like charges repel. Electrons have negative charge, so two electrons repel each other. A changing magnetic field produces an electric field, so the free electrons move in response to the field. As they move, they also create a magnetic field. It’s complicated. In short, the moving magnetic field in a generator pushes on the free electrons.
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  2. If the current is zero when a voltage is applied, then the resistance is infinite. The voltage drop across an infinite resistance will be zero.
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  3. Unless there is a fault, the current is the same throughout a circuit.
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  4. Adding loads in parallel increases the current. That’s like adding more lanes to a freeway.
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  5. No. Volts are a measure of electric potential difference, i.e. the electric force.
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  6. We have never used Imperial units in the US. We use US Customary units (and Metric units).
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  7. Current is how many electrons are flowing per unit time. One Ampere is one Coulomb of charge per second.
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  8. Yes, that is an error.
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  9. A current flows through the person to ground, as shown. The neutral of the system is connected to ground.
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  10. The current flows through both wires at the same time, reversing direction 120 times per second. As far as the circuit is concerned, both wires are equivalent. The current moves back and forth in the circuit. I wish people would stop using the term “return,” which just confuses novices. “Live” (or “hot”) means that a wire has a significant electric potential relative to ground. “Neutral” means a conductor that is tied to ground potential.
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  11. It is a code for the value of resistance.
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  12. In a simple case of a constant resistive load, amperage is proportional to voltage.
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  13. We measure voltage with a high-impedance circuit through the meter such that the current through it is so small that we can disregard it.
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  14. Every tangible thing is made of atoms, and every atom has electrons associated with it. The electron is the carrier of negative electric charge. Some electrons are loosely bound to their atoms. When they get loose and move somewhere else, we call that electricity.
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  15. No, it is just electrons per second.
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  16.  @csp405  — wrong
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  17. Ohm’s Law: E = IR. E is voltage; I is amperage; R is resistance in Ohms.
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  18.  @csp405  — Ohm’s law. Ampetes = Volts / Ohms. The resistance is 0.5 Ohms because two identical loads in parallel have half the resistance of one load.
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  19. “Hot” means that there is a significant electric potential relative to ground. You will get a shock if you touch it and provide a path to ground. “Neutral” is a conductor held at ground potential. Both hot and neutral wires are current carriers.
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  20. AC allows a transformer to be made because the principle of a transformer is that a moving magnetic field induces a current in a conductor. A steady DC has a stationary magnetic field around the conductor. Once you have a transformer you can make high voltage. High voltage will transfer a given level of power with fewer Amperes than a low voltage. Fewer Amperes means lower losses in the transmission lines, and smaller wires in the transmission lines. If you exceed the current carrying capacity of a wire it will heat up and melt, like a fuse. In short, high voltage allows the transmission of large amounts of power over wires. Another factor is that AC can be transmitted in three phases over three wires in a delta configuration. Twice the power can be transmitted with three wires instead of two.
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  21. I don’t like it and I don’t like gratuitous vulgarity, either.
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  22. Heat is just a statistical representation of the kinetic energy of atoms.
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  23. All filaments have resistance, but they heat up more when there is more current through them.
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  24. No. The Ampere rating on the power supply is its maximum output.
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  25. The electromagnetic field propagates the signal from the moving electrons at near the speed of light. The electrons, the charge carriers, don’t move from the source to the destination. There are free electrons everywhere in the conductors which are influenced by the field.
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  26. The current is the same.
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  27. No, electrons are not converted, they are just moved. around. The energy of motion of the electrons produces the heat. Actually, heat is just a statistical representation of the kinetic energy of vast quantities of atoms. The electric current transfers energy to the load. Some energy is lost everywhere in the circuit, but most of it where the impedance is greatest.
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  28. You are correct.
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