Herb and Eneva wrote:
Will someone please explain the difference between the grounding
wire---white, and the grounded wire---green, in a circut? They both go
to the same busbar.

Lots of reasons; it -can- get complicated to explain, but here's one
situation:

Any exposed metal in what's called Class 1 equipment (Stove, fridge, etc)
must be grounded. The green ground wire is used for that ground. Its sole
purpose for existance is safety. In addition, the blk/wh wires are NOT
connected to the exposed metal; doors, cabinet, legs, etc etc. in equipment
in today's equipment; it was different "yesterday". The reasoning here has
to do with "polarity" of the hot/neutral. Should it be reversed, then the
exposed metal would become "hot".
So, if a miswire or fault occurs, which would/could place the exposed
metal at 120V, the green ground wire connection would keep the exposed metal
at ground poetntial instead of letting it go to 120V. In a properly wired
ckt, it would also pop the fuse/breaker. In a miswired ckt the breaker
would still pop since whatever is providing the 120V has to be coming from a
fuse/breaker.
Without the ground wire, touch the exposed metal and any other grounded
point, such as faucets, nearby equipment, cement floor, lamp housing, etc.,
and you might well be electrocuted.

I would recommend some online research for further info; there's a lot of it
available. Also, ignore the other advice here so far; those people are
gussing and goind a bad job of it at that.

HTH,

Pop`