How many milliamps are equivalent to one ampere?

• A. 100.
• B. 1,000.
• C. 10,000.
• D. 100,000.

Answer: (B)

One ampere is equivalent to 1,000 milliamps because the prefix "milli-" denotes a factor of one-thousandth. In the metric system, this means that 1 milliamp is one-thousandth of an ampere. Therefore, when converting amperes to milliamps, you multiply the number of amperes by 1,000. For instance, if you had 1 ampere and wanted to express it in milliamps, you would calculate 1 × 1,000, resulting in 1,000 milliamps. This conversion is fundamental in electrical engineering, providing precision when working with varying scales of current.