Phasor https://www.electronics-tutorials.ws/accircuits/phasors.html

Phasor Diagram

phasor diagrams can be thought of as representing “functions of time”.

This is how everything is connected, the Capacitor and Capacitor and Inductor and how either Current lags or leads behind Voltage.

Say you measure the voltage and current over time, and this is what you see.

You can use a phasor diagram representation.