Amp Up Your NEIEP Electrical Skills 2026 – Master the Fundamentals Like a Pro!

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What does the term phase relate to?

The relationship of one sine wave to another in terms of time delay

The relationship of one sine wave to another in terms of electrical degrees

Phase describes how far one sine wave is shifted relative to another within a cycle, and it’s measured in electrical degrees. This tells you whether the waves line up or one leads or lags the other, with 0° meaning they peak together, and 90° or 180° indicating quarter- or half-cycle differences. It’s about the timing relationship between waves, not their height (amplitude) or how fast they repeat (frequency). A time delay can produce a phase shift, but in practice we express that shift in degrees for AC analysis.

The amplitude difference between two sine waves

The frequency difference between two sine waves

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