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Q&A How long does it take for energy to propagate in a circuit?

This is someone trying to rehash a Light experiment with circuits, however I do not think it holds up. Inside a medium, charged particles are subject to Drift Velocity. When you work through the ca...

posted 2y ago by Meat5000‭

Answer
#1: Initial revision by user avatar Meat5000‭ · 2021-12-08T08:37:22Z (over 2 years ago)
This is someone trying to rehash a Light experiment with circuits, however I do not think it holds up. Inside a medium, charged particles are subject to Drift Velocity. When you work through the calculations I do believe the particles move at the rate of Centimetres per second through the wire. The energy would propagate at the speed of light except that there is inherent Capacitance and Inductance to take into account which has the effect of building up energy within it, slowing down its propagation.

If the experiment were talking about a Radio Wave transmitted or some such event it may work. For the sake of engineering method, it is assumed that the conditions are ideal.

The other thing to consider is that within a wire not all the electrons are pushing the same direction. You can not control the direction of travel of an electron. You build up potential at one end and those moving the oppostite way tend to propagate. The others collide creating heat. So not all the energy is even moving the right way, in terms of this experiment.