In technical fields such as electrical engineering and signal processing, complex numbers are used to represent quantities like impedance. Match each component of a complex number written in its standard form, $a + bi$, with its correct description.

As an apprentice in a technical training program, you are learning to use diagnostic software that models alternating current (AC) circuits. The software requires you to input impedance values using the standard form of a complex number. Which of the following structures represents this standard form?

Validating Technical Documentation Standards

In technical documentation for electrical engineering, complex numbers are recorded in the standard form $a + bi$. In this format, the component $a$ represents the real part of the complex number.

In professional technical documentation for electrical systems, complex numbers must be recorded in the standard form $a + bi$. In this representation, the term $bi$ is referred to as the ____ part of the complex number.