expressed current. T8 Tube
13/09/2013 09:51
I. What is the power factor
We know that all generators are rotating machinery , the resulting voltage is sinusoidal , this is what we called alternating current. An alternating current through electromagnetic induction advantage that can be used to change the voltage transformer , and can be increased to hundreds of thousands of volts to reduce long-distance transmission loss in transmission , after the destination becomes lower and lower down the city we used electricity. We now mains is 220V, 50Hz AC. In alternating current electrical engineering where the vector can be used to represent . Indicates the voltage vector can also be expressed current. T8 Tube
For purely resistive load , the voltage and current are in phase , and for purely capacitive loads or purely inductive load, the current and voltage on the different phases , but there is a 90 degree phase angle , or as a phase difference . In a pure inductive load, the voltage on its leading current 90 degrees, while the purely capacitive load, the voltage lags behind its current 90 degrees.
If we use the representation of the waveform when the voltage is usually expressed as a cosine wave , if the current lags the voltage , that is, inductive load , leading to the voltage that is capacitive loads.
Figure 1 . Inductive load AC voltage and AC current relationship between
