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⭐ Core Definition: Phase shift

In physics and mathematics, the phase (symbol φ or ϕ) of a wave or other periodic function $F$ of some real variable $t$ (such as time) is an angle-like quantity representing the fraction of the cycle covered up to $t$ . It is expressed in such a scale that it varies by one full turn as the variable $t$ goes through each period (and $F(t)$ goes through each complete cycle). It may be measured in any angular unit such as degrees or radians, thus increasing by 360° or $2\pi$ as the variable $t$ completes a full period.

This convention is especially appropriate for a sinusoidal function, since its value at any argument $t$ then can be expressed as $\varphi (t)$ , the sine of the phase, multiplied by some factor (the amplitude of the sinusoid). (The cosine may be used instead of sine, depending on where one considers each period to start.)

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Phase shift in the context of Tide

Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon (and to a much lesser extent, the Sun) and are also caused by the Earth and Moon orbiting one another.

Tide tables can be used for any given locale to find the predicted times and amplitude (or "tidal range"). The predictions are influenced by many factors including the alignment of the Sun and Moon, the phase and amplitude of the tide (pattern of tides in the deep ocean), the amphidromic systems of the oceans, and the shape of the coastline and near-shore bathymetry (see Timing). They are however only predictions, and the actual time and height of the tide is affected by wind and atmospheric pressure. Many shorelines experience semi-diurnal tides—two nearly equal high and low tides each day. Other locations have a diurnal tide—one high and low tide each day. A "mixed tide"—two uneven magnitude tides a day—is a third regular category.

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Phase shift in the context of Three phase

Three-phase electric power (abbreviated 3ϕ) is the most widely used form of alternating current (AC) for electricity generation, transmission, and distribution. It is a type of polyphase system that uses three wires (or four, if a neutral return is included) and is the standard method by which electrical grids deliver power around the world.

In a three-phase system, each of the three voltages is offset by 120 degrees of phase shift relative to the others. This arrangement produces a more constant flow of power compared with single-phase systems, making it especially efficient for transmitting electricity over long distances and for powering heavy loads such as industrial machinery. Because it is an AC system, voltages can be easily increased or decreased with transformers, allowing high-voltage transmission and low-voltage distribution with minimal loss.

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Phase shift in the context of "Wave (physics)"

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⭐ Core Definition: Phase shift

Phase shift in the context of Tide

Phase shift in the context of Three phase