Can an Electric Current Travel Instantly Across a 3000000km Long Cable?

In summary, the conversation discusses the possibility of using a 3000000km power cable to transmit electric current and Morse code. There are questions about whether a current detector on the cable would detect the current and if opening and closing a switch on the cable would allow for Morse code communication. The conversation also mentions the idea of a 1LY (light year) long cable and the possibility of instant communication over such a distance. There is a request for someone to write a FAQ on this topic.
  • #1
salor
1
0
Hi, all.
There's a thought flashing through my mind yesterday.
Sorry for my lack of knowledge. The thought must be something wrong.
Can anyone correct it? Thanks
If there is a 3000000km long power cable, and the cable is pulled to 3000000km away from the earth.
A power source connected on one side A of the cable on the Earth keeps outputting the electric current, and the switch of side B on the cable (away from Earth 3000000km) is close. And there's a "current detector" on the cable away from side A by 1km. Does the detector detect the current?
At a specific time, if the switch of side B starts to open, does the current start to go from A simultaneously?
If so, people can open and close switch of side B to let people on side A know Morse code .
If the cable is 1LY long, will transmitting message to 1LY away instantly comes true?
 
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Related to Can an Electric Current Travel Instantly Across a 3000000km Long Cable?

1. What is an electric current?

An electric current is the flow of electric charge through a conductive material, such as a wire. It is measured in units of amperes (A) and is caused by the movement of electrons.

2. How is an electric current created?

An electric current is created by a difference in electric potential, also known as voltage, between two points in a circuit. This difference in voltage causes the electrons to flow from a higher potential to a lower potential, creating the current.

3. What are the types of electric current?

There are two types of electric current: direct current (DC) and alternating current (AC). DC flows in one direction, while AC alternates between flowing in one direction and then the opposite direction.

4. How is an electric current measured?

An electric current is measured using an ammeter, which is connected in series to the circuit. The ammeter measures the flow of electrons in the circuit and displays the current in units of amperes (A).

5. Can an electric current be harmful?

Yes, an electric current can be harmful if it is strong enough. It can cause electric shocks, burns, and even death. It is important to handle electrical devices and circuits with caution and to always follow safety precautions.

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