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  2. Sine wave - Wikipedia

    en.wikipedia.org/wiki/Sine_wave

    A sine wave, sinusoidal wave, or sinusoid (symbol: ∿) is a periodic wave whose waveform (shape) is the trigonometric sine function. In mechanics , as a linear motion over time, this is simple harmonic motion ; as rotation , it corresponds to uniform circular motion .

  3. Alternating current - Wikipedia

    en.wikipedia.org/wiki/Alternating_current

    The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a cycle). "Alternating current" most commonly refers to power distribution, but a wide range of other applications are technically ...

  4. Envelope (waves) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(waves)

    A modulated wave resulting from adding two sine waves of identical amplitude and nearly identical wavelength and frequency. A common situation resulting in an envelope function in both space x and time t is the superposition of two waves of almost the same wavelength and frequency: [2]

  5. Function generator - Wikipedia

    en.wikipedia.org/wiki/Function_generator

    In electrical engineering, a function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveforms over a wide range of frequencies. Some of the most common waveforms produced by the function generator are the sine wave, square wave, triangular wave and sawtooth shapes.

  6. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    The field produced by a single-phase winding can provide energy to a motor already rotating, but without auxiliary mechanisms the motor will not accelerate from a stop. A rotating magnetic field of steady amplitude requires that all three phase currents be equal in magnitude, and accurately displaced one-third of a cycle in phase.

  7. Chirp - Wikipedia

    en.wikipedia.org/wiki/Chirp

    The corresponding time-domain function for a sinusoidal exponential chirp is the sine of the phase in radians: = ⁡ [+ (⁡ ())] As was the case for the Linear Chirp, the instantaneous frequency of the Exponential Chirp consists of the fundamental frequency f ( t ) = f 0 k t T {\displaystyle f(t)=f_{0}k^{\frac {t}{T}}} accompanied by ...

  8. Leading and lagging current - Wikipedia

    en.wikipedia.org/wiki/Leading_and_Lagging_Current

    Angle notation can easily describe leading and lagging current: . [1] In this equation, the value of theta is the important factor for leading and lagging current. As mentioned in the introduction above, leading or lagging current represents a time shift between the current and voltage sine curves, which is represented by the angle by which the curve is ahead or behind of where it would be ...

  9. Single-phase generator - Wikipedia

    en.wikipedia.org/wiki/Single-phase_generator

    The energy for the water main in this case was not created by gravity, but the water was pumped by a larger steam engine at a water pumping station to supply water to customers. The decision to have water pumped by a larger engine then take some of the energy from water flow to power a smaller generator using water wheel was based on the cost.

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