Answer:
this is an action verb in past tense.
Explanation:
Answer:
there was once
Explanation:
its explaining a time from before where there "once was " and then a situation hope that helps ^^
Its being explained in the sentence
The difference between the split ring commutator in a DC motor and the slips rings in an AC generator can be tricky. The split ring makes changes in the rotation every so often. A slip ring just stays in place and is only used as a connector. So a slip ring is for DC, whereas the split ring is used for AC.
