why are there different sized batteries (aaa-D, etc) if they all put out the same 1.5v?
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Try thinking of the battery and the electricity as a watering can with water in it. The holes in the spout of the watering can are a specific size, and when you pour out the water, it comes out at a specific rate because of how big the holes are. Now imagine you make the can bigger, but the holes remain the same. Now you are still putting out the same rate of water (the voltage) but you have more water, so you can use it a lot longer.
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