7 relations: Angle notation, Bioelectrical impedance analysis, Complex number, Electrical impedance, Phase (waves), Phasor, Sine wave.

## Angle notation

Angle notation or phasor notation is a notation used in electronics.

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## Bioelectrical impedance analysis

Bioelectrical impedance analysis (BIA) is a commonly used method for estimating body composition, and in particular body fat.

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## Complex number

A complex number is a number that can be expressed in the form, where and are real numbers, and is a solution of the equation.

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## Electrical impedance

Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.

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## Phase (waves)

Phase is the position of a point in time (an instant) on a waveform cycle.

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## Phasor

In physics and engineering, a phasor (a portmanteau of phase vector), is a complex number representing a sinusoidal function whose amplitude (A), angular frequency (ω), and initial phase (θ) are time-invariant.

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## Sine wave

A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation.

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