Mark Lloyd laid this down on his screen :
On 05/30/2016 01:18 PM, FromTheRafters wrote:

[snip]

Undefined! Because A=V/R and you can't divide by zero.

This is simple math, why are you struggling with it?

With any 2 nonzero numbers, A/B is the reciprocal of B/A. In other words,
(A/B)*(B/A)=1. If you make A=0, then A/B=0. B/A should then give the
reciprocal of 0 (as in, what do you multiply 0 by to get 1). How about
infinity?

Still doesn't explain 0/0.

If you don't like this, please don't read it :-)

Maybe you could multiply it by itself zero times. Anything to the
zeroeth power equals one.

Okay, so multiplicative groups kick out the zero, it was worth a try.