Just turn this thing here... and iron.

And then we put a lead, which is a wire, in the right ventricle inside the heart, which does the electrogram, which is the signal voltage from inside the heart.

You have to put in hundreds of microscopic wires to record from little tiny individual neurons ordinary fibers that put out tiny signals that are microvolts.

Although silicon s light absorbing properties are suitable for photovoltaic devices, the near 0.5 volts that it generates is too weak to split water in a solar fuel generator.

In electric circuits analysis, nodal analysis, node voltage analysis, or the branch current method is a method of determining the voltage (potential difference) between nodes (points where elements or branches connect) in an electrical circuit in terms of the branch currents.