Home » Measurement Units » 4 » d One quarter of one ampere may be written as: a. 250 microampere b. 0.5 ampere c. 0.25 milliampere d. 250 milliampere Your answer "d" is CORRECT! The prefix 'milli' or 'm' means thousandth. The prefix 'micro' or 'u' means millionth. Next |