Timeline for Why are circuits considered loops?
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| Oct 15, 2017 at 10:21 | comment | added | Jay M | Simple is good. The Kirchoff/Maxwell simplification stands true. Perhaps you were considering the emitted RF as part of the circuit from a current perspective? This is no more true than the heat emitted in a resistor being part. Remember Maxwell's equations are general and don't just describe free waves in space. | |
| Oct 15, 2017 at 10:13 | comment | added | Jay M | An antenna IS a closed circuit. A conventional antenna has two 'plates' with an alternating collapsing charge moving between them. Because of the ground plane effect even a simplified antenna has one real conductor and an imaginary one, see en.wikipedia.org/wiki/Monopole_antenna. | |
| Oct 14, 2017 at 3:52 | comment | added | alephzero | This is over simplified. For example, a radio transmitter definitely has a "current" flowing to the antenna - you can measure it with an ordinary meter - but the antenna itself is not a "closed circuit." Physically, it's just a collection of bits of conducting material constructed in a particular geometrical configuration. If you measure the DC resistance between the "termials" of the antenna, it is an open circuit! | |
| Oct 12, 2017 at 19:35 | history | answered | Jay M | CC BY-SA 3.0 |