The potential difference between two points in an electric circuit is the work done when a coulomb of charge passes between the points. You can calculate the size of a potential difference using this equation: V = W Ã· Q. 1  V is the potential difference in volts, V. 2  W is the work done (energy transferred) in joules, J.
Thanks for you help. Yikes, now you got me thinking! I went and my bottle of wilton vanilla and sure enough, it was like I went to the medicine cabinet and opened the bottle of rubbing alcohol! Extract is about 35% or so alcohol, so it may smell like alcohol - but the primary aroma should be vanilla.
I'm the sort who'll spring for vanilla extract every time, but some people really prefer the taste of imitation vanilla (which is high in vanillin, a flavor that's very similar to the strongest notes in Tahitian vanilla) and I think that so long as people are happy with the taste, they should use what they like.