Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits

RL Series Circuit

A circuit containing a pure resistance and pure inductance connected in series shown in figure 1.64(a).

RL SERIES CIRCUIT

A circuit containing a pure resistance and pure inductance connected in series shown in figure 1.64(a).


Let,

V = rms value of applied voltage

L = Inductance in henry

I = Current flowing in RL series circuit (rms value)

VR = Voltage drop across R

VL = Voltage drop across L

In a pure resistor circuit, V and I are in phase. In pure inductor circuit, the current said to be lagging by 90° with respect to VL.

The applied voltage V is


The quantity is called as impedance of the circuit. From the figure 1.64(c), phasor diagram, (OAB triangle)

Z2 = R2 + XL2

where XL = Reactance

Z = Impedance

It is noted from the figure 1.64(c), the current I lags behind the applied voltage by angle ϕ.


Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits : Tag: : - RL Series Circuit


Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits



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