In electrical circuits, the voltage and current can be described by sine or cosine functions. If the graphs of these functions have the same period, but do not pass through their zero points at the same time, they are said to have a phase difference. For example, if the voltage is 0 at 90° and the current is 0 at 180°, they are 90° out of phase. Suppose the voltage across an inductor of a circuit is represented by y 2 cos 2x and the current across the component is represented by
What is the phase relationship between the signals?