Which is equal to one microvolt?

In the metric system, prefixes are used to denote powers of ten to easily represent very large or very small numbers. The prefix 'micro-' specifically means one one-millionth. Therefore, one microvolt is exactly one one-millionth of a volt. Other prefixes represent different values and are often used as distractors in exam questions. For example, 'milli-' means one one-thousandth, and 'mega-' means one million. Remembering that 'micro' represents an extremely small fraction (a millionth) will help you avoid confusing it with 'milli' (a thousandth).