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here a quick drawing its not the best lol
**broken link removed**
I think he means positive and negative.
Live and neutral are used for AC circuits, live is also sometimes called, phase, line or in the US hot, probably because it can burn you. Neutral is often called return or 0V.
A word of warning about universal motors that have variable speed on DC, use full power so you bypass the electronics since they go full on anyway.
Kinarfi
On many gas powered welding machines, there is a 120 vdc outlet for plugging drills and grinders into. I you plug a Milwaukee (for example) variable speed drill into it, as soon as you pull the trigger just a little, it goes full speed because the Triac fires and stays fired waiting for the zero crossing which will never come, so the triac is handling the current. If you pull the trigger full on, you have bypassed the triac and have a metal to metal contact path. The triac may be tough enough to handle the load, but why chance it. So unless you have a different type of speed control which is designed for DC, the common A C variable speed control in most A C tools won't work any way.Please explain this comment. Are you saying to not control a universal motor speed if you're using DC?