i need to calculate the time it takes for a telephone signal to be transmitted to a satellite and then from a satellite to the receiver telephone. i have all the information except for this little part- the speed of telephone signals in an electric wire. cud u help me?
2006-11-13 04:50:15 · 6 answers · asked by amandac 3 in Science & Mathematics ➔ Physics
the majority of the lost time is not in the wire it is in the switch so you are going to get it wrong
as for the speed in theory electricity flows at the speed of light but in actual use the resistance of the wire and the circuit slows it down but the speed is so great that unless you are talking milliseconds it is instantaneous
2006-11-13 04:52:36 · answer #1 · answered by Anonymous · 0⤊ 0⤋
186,000 miles per second (speed of electricity and light), which is OK if that is your complete calculation, but since modern telephone systems convert the voice signals to digital then send them as packets to optimize the communication media, your signal may be delayed by having to wait for a gap in the other traffic. Although these delays are too small to significantly affect your telephone conversation, it is a big part of the delay.
2006-11-16 18:41:24 · answer #2 · answered by Poor one 6 · 0⤊ 0⤋
Instead of using electrical signals in a telephone line, change it to fibre optics.
Telephone wires nowdays are being replaced with fibre optics as they provide no loss in communications
Fibre optics send light as pulses (1 being on, 0 being off for example) instead of electrical signals but still carry the same imformation.
If you use fibre optics then the speed of the signal is
3x10^8 ms^-1 ie c
2006-11-13 13:00:33 · answer #3 · answered by Oz 4 · 0⤊ 0⤋
the speed of photons in a wire is called the VELOCITY OF PROPIGATION. in COAX, like cable TV wire, its about 65% of C.
for glass, the figure is C/optical index. also about 65%
it's probably safe to use that value for twisted pair.i looked up one type and found 66%
note that the ELECTRONS in a wire generally don't move at all, they just vibrate back and forth. In a DC circuit, the speed of the elctrons is about the speed of sound.
2006-11-13 14:15:22 · answer #4 · answered by disco legend zeke 4 · 0⤊ 0⤋
electrons theoretically travel at the speed of light when unimpeded, however, each time they pass through a component, they are slowed. Without a detailed circuit analysis theres no way to give an accurate answer. I suppose you could assume 90% C and be pretty close.
2006-11-13 12:55:40 · answer #5 · answered by davidosterberg1 6 · 0⤊ 0⤋
300,000,000 Meters/sec. 3X10 to the power of 8
2006-11-13 12:53:27 · answer #6 · answered by likos1 1 · 0⤊ 0⤋