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Voltage is Applied to a Deenergized Inductive Circuit  An Energized Inductive Circuit is Short Circuited  
E = applied potential. 
E = counter potential induced in
coil when Sw is closed. 

In a Capacitive Circuit  In an Inductive Circuit  
In a capacitive circuit, where resistance loss components
may be considered as negligible, the flow of current at a given alternating potential of constant frequency, is expressed by 
In an Inductive circuit, where inherent resistance and
capacitance components may be so low as to be negligible, the flow of current at a given alternating potential of a constant frequency, is expressed by 

where

I
X_{C} E 
=
= = 
current in amperes,
capacitive reactance of the circuit in ohms, applied potential in volts. 
where

I
X_{L} E 
=
= = 
current in amperes,
Inductive reactance of the circuit in ohms, applied potential in volts. 
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