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You might think it strange to be concerned with angles in electrical circuits. The reason is simply that, in analogue and a.c. circuits, signals are based on repetitive waves (often sinusoidal in shape). We can refer to a point on such a wave in one of two basic ways: either in terms of the time from the start of the cycle or in terms of the angle - a cycle starts at 0° and finishes at 360°. In practice, it is often more convenient to use angles rather than time, however the two methods of measurement are interchangeable.
<^< Examples: Amplitude and Frequency | Course index | Radians >^>
