Final answer:
The prefix "giga" (G) is associated with the power of 10⁹, representing a factor of one billion.
Step-by-step explanation:
The power of 10 that is associated with the prefix "giga" (G) is 10⁹. In the International System of Units (SI), the prefix giga is used to denote a factor of a billion, which is numerically equivalent to 1,000,000,000 or 10⁹ when written in scientific notation. This prefix is commonly seen in terms such as gigahertz (GHz) to represent 10⁹ hertz, which is one billion hertz, or as in gigawatt (GW) to describe one billion watts of power.