What is the difference between maximal flow and maximum flow?

What exactly does poential difference mean? Why does a current flow with voltage difference?

• ok please alear this up for me: if lets one metal has voltage of 1.76 v and another at -0.34 V what DOES THE NUMBER MEAN? what does "VOltage" mean?- does it mean to ...show more

• Answer:

  Potential difference is a kind of pressure difference, except it's electricity and not air or water. If you and I meet, and you have a supersoaker, and you press the trigger, then the air pressure difference (pounds per square inch) will cause the water to flow from you to me. Also, huge numbers of electrons build up in storm clouds, which become highly negatively charged. The Earth is relatively positively charged. When the electrical potential difference (volts) reaches a critical value, a lightning bolt will shoot from the cloud to the Earth. You want to ask about standard single-electrode potentials. A single electrode potential means the contribution of one chemical reaction to the voltage generated by a whole cell of two electrodes. The potentials of the two of them together add up to the voltage delivered by the whole cell. For example: Cu ===> Cu2+ -0.34V When you oxidize copper in an electrolytic or galvanic cell, it costs -0.34V to do it. By contrast, if you reduce copper, you get a voltage advantage: Cu2+ + 2e- ===> Cu +0.34V All these single-electrode potentials are based on a standard reaction: H2(g) ===> 2H+ + 2e- 0.00V and 2H+ + 2e- ===> H2 0.00V Also, standard electrode potential means that all the chemical solutions are 1M, and any gases, like H2, are 1 atmosphere. I could not find your metal that has +1.76V.The nearest that I could find was: Ti ===> Ti2+ + 2e +1.75V So I suggest that the answer to your immediate problem is the following cell: Ti ===> Ti2+ + 2e- +1.75V Cu2+ + 2e- ===> Cu +0.34V _________________________ ...............................2.09V And that is the voltage of the cell containing the two electrodes.