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Terms related to ac circuits
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Terms Related to ac Circuits.
(1) Resistance (R) : The opposition offered by a conductor to the flow of current through it is defined as the resistance of that conductor. Reciprocal of resistance is known as conductance (G) i.e. G=(1/R)
(2) Impedance (Z) : The opposition offered by the capacitor, inductor and conductor to the flow of ac through it is defined as impedance. It’s unit is ohm. Z=(V0/i0 )= (Vrms/irms)
(3) Reactance (X) : The opposition offered by inductor or capacitor or both to the flow of ac through it is defined as reactance. It is of following two type –
Note :Resultant reactance of LC circuit is defined as X=XL ~ Xc.
(4) Admittance (Y) : Reciprocal of impedance is known as admittance (Y=(1/Z)) It’s unit is mho.
(5) Susceptance (S) : the reciprocal of reactance is defined as susceptance (S=(1/X)) It is of two type
(i) inductive susceptance SL = (1/XL) = (1/2pv L ) and
(ii) Capacitive susceptance, Sc = (1/Xc ) = w C = 2pv C.
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