How many milliamperes is 1.5 amperes?

In the metric system, the prefix 'milli' means one one-thousandth (1/1,000) of a base unit. This means there are exactly 1,000 milliamperes in a single ampere. To convert from a larger base unit (amperes) to a smaller metric unit (milliamperes), you must multiply the value by 1,000, effectively moving the decimal point three places to the right. Doing the math, 1.5 amperes multiplied by 1,000 equals 1,500 milliamperes. The other options are simply incorrect decimal shifts.