Maximum,meaning the most. And ion,which is an atom or group of atoms with an electrical charge.

VOA: special.2010.05.30

Now if the spinal cord is injured, for example, what we propose to do is to tap into the electrical signals associated with individual neurons.

现在，如果脊髓受到伤害，我们建议去接近与单个神经元,相联系的电子信号。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Nerve cells use electrical particles to communicate with each other.

VOA: special.2010.10.26

"Someone could attack the industrial control systems that control all the valves, all the distribution systems, and are used to turn on and off various aspects involved with energy and the electrical power grid and oil and gas distribution networks,".

VOA: standard.2009.08.11