Posted by Jock(OR) on November 11, 2012 at 10:21:07 from (71.216.23.229):
In Reply to: 9v Battery for 8N posted by equeen on November 11, 2012 at 05:06:07:
JMOR is on the right track in explaining voltage/amperage with his water analogy, but I will take it a little further to explain this particular question.
The question is why wouldn't a 9V radio battery substitute for the 6V tractor battery?
Think of the small battery as a tank the size of a pill bottle, full of water and pressurized to 9 psi. If you open a valve on the tank it will squirt out the water at 9 psi until it is all gone. Now think of a tank holding 50 gallons of water pressurized at 6 psi. If you open a valve the same size as the one on the first tank, the water will squirt water out at a lower rate than the first tank, but it will run out MUCH longer.
To simulate a starter, the opening in the valve would be as big as the whole small tank. The water would disappear instantly as the valve opened. The larger tank would last quite a while.
I hope this helps understand the principles of DC electricity.
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