## If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? [T5B06]

A. 0.003 amperes

B. 0.3 amperes

C. 3 amperes

D. 3,000,000 amperes

Don’t panic! This is a simple question about unit conversions, nothing more.

Remember your definitions of metric prefixes. Milli means one one-thousandth, or 0.001. Therefore, one milliampere is one one-thousandth of an ampere, or amp. We can just multiply like this (and also remember to bring your calculator with you to the test!)

and our answer is then **C. 3 amperes.**