Technician: Ammeter Current Display

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!)

3000 x 0.001 = ?

and our answer is then C. 3 amperes.

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