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Tuesday, 7 March 2017

Alternating Current - II


Reactance:
Reactance

Inductive reactance

Capacitive reactance

Impedance:

Impedance is defined as,


Where f is the phase difference of the voltage E relative to the current I.
a) For L – R series circuit:
b) For R – C series circuit:
c) For L – C series circuit:
Conductance:

Reciprocal of resistance is called conductance.
Power in and AC Circuit:

a) Electric power = (current in circuit) x (voltage in circuit)
P = IE

b) Instantaneous power:

c) Average power:

d) Virtual power (apparent power):

Power Factor:

a) Power factor
b) For pure inductance

Power factor, cosf  =1

c) For pure capacitance

Power factor, cosf  =0

d) For LCR circuit

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