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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: 9v Battery for 8N

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Author  [Modern View]
Jock(OR)

11-11-2012 10:21:07
71.216.23.229



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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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