There would, however, be a range for 10 -6 amperes. It is more sensible to convert large and small numbers using engineering notation rather than simple scientific notation. Remember, we want a multiple of three. This means that we want to convert the number to something X 10 -6 . If we move the decimal one more place to the right, our number will become 30.6 X 10 -6 amperes or 30.6 microamps.
Lets convert some of the other previous examples to engineering notation.
To convert 0.000003, we would move our decimal point to the right 6 positions. Our number would then become 3 X 10 -6 . This number is expressd in scientific notation not engineering notation. If you told some one that you wanted to measure 3.06 X 10 -5 amperes you would probably get a strange look at the very least. This answer is impractical and inappropriate.