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## Homework Statement

I am supposed to determine the potential differences between the points. However, I thought circuits had to be closed...

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- Thread starter joel amos
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I am supposed to determine the potential differences between the points. However, I thought circuits had to be closed...

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Stephen Tashi

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gneill

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So how then do I calculate potential difference without current?If there is no current, then no voltage is dropped across each resistor.

I'd usually use the formula V = I*R.

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gneill

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Yes, and if I=0?So how then do I calculate potential difference without current?

I'd usually use the formula V = I*R.

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Well, then there would be no drop in voltage. Does this mean that the potential difference at all three points is the same?Yes, and if I=0?

EDIT: Well I guess there would be current through R

So then would the potential difference between A and B be 9 V, the difference between A and C be 9 V, and the difference C and B be 0 V?

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gneill

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Not quite. The battery will maintain a fixed potential difference regardless of current flow or not.Well, then there would be no drop in voltage. Does this mean that the potential difference at all three points is the same?

Yup.EDIT: Well I guess there would be current through R_{2}.

So then would the potential difference between A and B be 9 V, the difference between A and C be 9 V, and the difference C and B be 0 V?

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Stephen Tashi

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So how then do I calculate potential difference without current?

How do you find potential difference across the two terminals of a battery when they aren't connected ?

What would the potential difference be in the ends of two unconnected wires that had their other ends connected to opposite terminals of a battery?

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