As you can in the first picture here a student entered .5 Amps and received full credit.

However, on a subsequent attempt he entered .5 amps and received a penalty.

I thought, from reading on this site, that the units should have been case in-sensitive. But, since they weren't I tried to add the "amps" unit to the question.

But, when I click to save, I get a database error.

I filed error #MDL-22117.