I have just a quick question.

Most batteries are 1.5V so......

If I use two AAA batteries does that mean my circuit now has 3V?

Thanks

Hi TexanBackpacker,

You got it. If you put two 1.5V batteries in series, the voltages would add up to give you 3V.

Humberto

If you take apart a 9V battery, you will find six little 1.5V cells. They can be flat cells stacked up or tiny cylindrical calls resembling the newer AAAA size without the finished end caps and labels.

This applies to both the dry cell type as well as the alkaline cells.

If you were working with lead/acid batteries, the voltage per cell would be about 2V instead of 1.5V but the concept is the same. That is why there are six fill caps on a car battery for 12V.

One notion to try to remember is the term 'battery'. Though it is used to describe the whole range out there, the actual meaning is a group of two or more cells.