What is the maximum distance allowed between the center of hole #2 and datum B as seen in the front view?

4.003" (inches )

Explanation:

The maximum distance allowed between the center of hole #2 and datum B can be calculated by adding 4.000" + 0.003" ( perpendicularity of the of hole #2) as seen from the front view of the diagram .

Note :The hole 2 is sited below the workpiece when viewed from the front view while the Datum B is positioned on the left end of the workpiece also note that the diameter is

i'm thinking more like energy

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6