Delay in 3 meters of wire

amdx · 2014-02-05T02:39:48+00:00

Hi Guys, I have question about transit time in a wire and phase shift caused by inductance. I'm going to use 3 meters of wire and 300,000,000m/s (discuss speed later) 300,000,000m/3m =10 nanoseconds, What travels? Will I measure both current and voltage as having a 10 ns delay at the other end of the wire? Now, I wind the 3 meters of wire as a solenoid coil and I have a 30 uh coil. Now I will have a 90* phase shift between the current and voltage. (I think I may have stumbled on my answer, but, let me continue.) How does the 10ns add to the 90* phase shift. Ok, to try and answer my own question: The current and voltage both have a delay from one end of the wire to the other. If I'm looking at the voltage across and current through the inductor, the 10ns delay will not be seen. Both voltage and current will be delayed the same amount. However the current will have a 90* phase shift compared to the voltage. And both voltage and current will have delay of 10ns. Did I get it right? Can anyone help? Thanks, Mikek Discuss speed later, I didn't get to where I needed to discuss it. But, I understand RG58/U has .66 velocity factor, so 300,000,000m/s would reduce to 198,000,000m/s. Ladderline .91 velocity factor.