Electrical Systems

R-L Circuit
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V-I     Vr-Vx
Dummy Text Dummy Text im  =  Dummy Text Amp φ  =  Dummy Text °
v is the sinusoidal voltage source. v= v msin(ωt) Using calculus it can be shown that the current will be represented as i= i msin(ωt - φ) i m  =  v m R2 + (ωL)2 φ=tan-1 ( ωLR )

In RL series circuit the current lags voltage by angle φ degrees.