Question

what is the physical meaning of tg(theta) and what is the difference between tg(theta),cos(theta) and power...

what is the physical meaning of tg(theta) and what is the difference between tg(theta),cos(theta) and power factor in RLC circuit?Provide a graphical explanation for above.

Homework Answers

Answer #1

In a RLC circuit with AC currents the voltage and the current are not in phase, there is a phase difference.

Tan() = (Xc - XL)/R , ratio of reactive load to resistive load.

is the angle by which current leads the voltage.

Cos() = R/ sqrt( R2 + (Xc -XL) ) , is the ratio of resistive load to the total impedence.

In an AC circuit, current and voltage vary with time and also they differ in time, there is a phase difference as seen above depending on the type of load.

The power cannot be computed straight by IV as in the case of DC circuits .

Averaging the instantaneous power over one complete cycle

P = VrmsIrms Cos() ,

Cos() is called the power factor.

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