On the vocab page, can you put selection boxes to the right? In visual basic there is a type of setting for boxes where you can click and drag over the boxes, and whatever you touch turns on. It's not systematic, but it allows the user to flexibly select a short stack of words.
This requires more thought on my part -- your word "current" is the wrong word, but the Chinese word 电压, which means voltage, is the right concept... It just sounds really funny to say "that was 500 volts of voltage!". More correct but lame would be "that was 500 volts of electric potential!".
Not to be too technical, but current is measured in amperes (amps for short) and electric potential is measured in volts.
@ rsalc: I found that understanding the radicals helps me "figure out" the characters and recognize new ones. Can anyone recommend a good reference for learning the radicals, 头‘s, etc for those of us who want to improve our reading and writing?