1.   Copper wires carry the electrical signals.

2.   However, we will from time to time assume that we are discussing electronic computers, implemented by the routing and gating of electrical signals.

3.   Images could be converted from light or other radiation to an analog electrical signal.

4.   In these, messages are carried as flashes of light rather than electrical signals so there is no possibility of interference.

5.   No electrical signal, whether down a wire or through the ether, appears able to travel faster than light.

6.   Radio antennas receive radio waves and change them into electrical signals which are then turned into sound by the speakers.

7.   Sending such digital signals lends itself well to using light along optical fibres rather than electrical signals along copper wires.

8.   The channel of communication is the copper wire which carries the electrical signals and runs to the distant end.

9.   The result was a group of cells with extra ion channels capable of producing stronger electrical signals.

10.   The traffic of ions into and out of neurons underlies their capacity to generate and transmit electrical signals.