Which of the following is equal to 1 ampere?

The correct choice is the one stating that 1 ampere is equal to 1,000 milliamperes. This is based on the definition of subunits of electrical current measurement. An ampere (A) is the standard unit of electric current in the International System of Units (SI).

To understand this, it's essential to know the relationship between amperes, milliamperes, and microamperes:

• 1 ampere is equal to 1,000 milliamperes because the prefix "milli-" denotes a factor of one-thousandth (1/1000). Therefore, 1 A equals 1,000 mA.

• Similarly, the prefix "micro-" denotes a factor of one-millionth (1/1,000,000). Thus, 1 ampere is also equal to 1,000,000 microamperes. This means that while the option stating 1,000,000 microamperes is a true statement, it does not indicate the conversion to milli-ampere.

• The option suggesting 100,000 microamperes would be less than 1 ampere, equating to only 0.1 amperes, which