Marine Electrical Systems USCG Question #1147 (Set 39)

A digital multimeter, set up as a milliammeter on the 100 milliamp scale, is known to have an accuracy of plus or minus 2%. A display reading of 10.0 milliamps would indicate an actual line current between what two values?

Official USCG Answer & Rule Citation

Correct Answer: Option C — 9.8 and 10.2 milliamperes

A ±2% accuracy on a 10.0 mA reading means the actual current is within 2% of 10.0 mA. This range is calculated as 10.0 mA ± (0.02 * 10.0 mA), resulting in a true value between 9.8 mA and 10.2 mA.

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