Comments by "GH1618" (@GH-oi2jf) on "How does a Transformer work - Working Principle electrical engineering" video.

  1. Your first question is moot. Lamps can be operated on AC and DC power. A common flashlight operates on DC. We have both AC and DC because both are useful. It isn’t a matter of high or low current.
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  2. Look at the videos on the 240V/120V split phase system to see how neutrals work. The basic idea is that you want part of the circuit to be connected to earth so there is a known voltage on a “hot” wire relative to earth.
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  3. Electromagnetism is a little like magic, except we understand it mathematically, if not physically. By “we” I mean physicists, not everybody. Keep in mind it is energy that must be conserved. Voltage is not energy. Voltage times Amperage is power, which is the rate of doing work (energy). The secondary has higher Voltage but lower Amperage and the power of the secondary cannot be more than that of the primary. It is a little less because some energy is lost to heat. No energy has been created, so the physicists are happy.
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  4. Any electric current creates a magnetic field. You need AC to create a continuously changing magnetic field.
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  5. In short, the inductance of rhe secondary impedes the current (I think). We characterize coils by their impedance rather than their resistance because they don’t behave like resistors when carrying AC.
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  6. There are electrons throughout the circuit at all times. Lots of them. The generator does not generate electrons; it generates a force on the electrons in its wires, making a current. Electric current creates a magnetic field. In a transformer the magnetic field from the current in the primary creates a force on the electrons in the secondary. The electrons do not move between the coils; only the field moves between the coils. What is the field? Beats me. Just mathematics as far as I know.
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