有趣電學問題，歡迎各物理程度者

(9ｖ)
－－－－battery－－－－－－
[--- 3 ohm 　--ａ-- 6 ohm---]
[--- 4 ohm 　--ｂ-- 2 ohm---]

－ , [ : connecting wire with neglectable resistance
上下兩條 wire 係 parallel， wire 中的 devices 係 in series
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1. wt is the volatge between pt. "a" and "b"
is that 3 V?

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-the 3 ohm has taken up 3v
so at pt "a" the potential is 9-3 =6V (i)
-the 4 ohm has taken up 6v
so at pt "b" the potential is 9-6 =3v (ii)
- potential difference between "a" , "b" is (ii) -(i) =3V?
2. is the above correct explanation?