Note 1 to entry: For a quantity ${\displaystyle a(t)=\widehat{A}\text{cos}(\omega t+{\vartheta }_0)}$ the phasor is ${\displaystyle \underset{\_}{A}=A\text{exp}(\mathrm{j}{\vartheta }_0)}$, where ${\displaystyle A=\frac{\widehat{A}}{\sqrt{2}}}$ is the RMS value and ${\vartheta }_0$ is the initial phase. A phasor can also be represented graphically.

Note 2 to entry: Electric current phasor $\underset{\_}{I}$ and voltage phasor $\underset{\_}{U}$ are often used.

Note 3 to entry: The similar representation with the modulus equal to the amplitude is sometimes also called "phasor".