fasvinkeln

Fasvinkeln, in Swedish, refers to the phase angle. In physics and electrical engineering, the fasvinkel is the angle by which a periodic waveform is shifted in time relative to a reference waveform. For sinusoidal voltages and currents, V(t) = V0 cos(ωt) and I(t) = I0 cos(ωt − φ); φ, written as fasvinkeln, is the phase angle between voltage and current. The fasvinkeln is measured in degrees or radians and determines the power factor, cos φ. A positive fasvinkel means the current lags the voltage; a negative fasvinkel means the current leads.

Using phasors, Ṽ = |V| ∠φ and Ĩ = |I| ∠0 with the reference as the voltage. For a linear impedance Z = R + jX, the fasvinkeln is φ = arctan(X/R). In a simple resistor, φ = 0°; inductor, φ = +90°; capacitor, φ = −90°.

Applications include the analysis of AC power systems, impedance matching, signal processing, and control systems. Measurement methods include oscilloscopes, LCR meters, and phasor analyzers. The fasvinkeln is central to determining reactive power and evaluating efficiency in alternating current circuits.

Etymology: fasvinkel is Swedish for phase angle (fas = phase, vinkel = angle). See also phase, phasor, impedance, reactive power, and power factor.