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I want to find the p.d. between points A and B. I'm not sure how to approach this problem though, could I have a hint?

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closed as off-topic by Brandon Enright, Emilio Pisanty, David Z Nov 12 '13 at 17:59

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Apply kirchhoff's voltage law to the outer circuit (EDCHGFE) and detrmine the voltage difference between F and C. The branch FC is an open circuit, what does that tell you about the voltage between B and C?? – Gotaquestion Nov 12 '13 at 16:29
I don't know that law... – bwv869 Nov 12 '13 at 16:46
I don't know that law... then here's a hint you can take to the bank: learn Kirchoff's Circuit Laws now. – Alfred Centauri Nov 12 '13 at 17:32

No current flows from C to B or A to F. So if you can find the potentials at C and F, you need only add or subtract the 4V potential. I would start by defining the potential at C, D and H to be zero. 12-8 and 10+5 may help get current for D to H, remember potential from D to H is zero, that's a wire.

Looking forward to your final solution.

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