I want to know the calculation. Thanks.
2006-09-30 12:26:40 · 3 answers · asked by GQ 1 in Science & Mathematics ➔ Chemistry
The voltage from a cell depends on the materials of the electrodes. To see how this is determined, go to http://en.wikipedia.org/wiki/Galvanic_cell
2006-09-30 13:04:15 · answer #1 · answered by gp4rts 7 · 0⤊ 0⤋
Actually, Nickle Cadmium batteries are 1.2v. It has to do with electron count of the molecules of the elements. Voltage is pressure that is created by the rule "opposites attract". When you charge a battery you force free electrons into the negative element make it more negative in relation to the positive element. The structure of the molecules only allows for a certain increase in free electrons and won't allow any more. That certain amount allows for a certain difference in the Plus - Minus balance and therefore the voltage (pressure) will vary.
The formula? I've never seen it or needed it. But I'm sure it comes in handy when you want to design a new type battery and want to know which elements to chose.
2006-09-30 12:44:09 · answer #2 · answered by vmmhg 4 · 0⤊ 0⤋
I don't know the exact calculation, but it has to do with the energy released by the chemical reaction and the materials position in the electromotive series.
Doug
2006-09-30 12:30:10 · answer #3 · answered by doug_donaghue 7 · 0⤊ 0⤋