An Inductor works as a ________ circuit for DC supply.
Induced voltage across an inductor is zero if the current flowing through it is constant, i.e. Inductor works as a short circuit for DC supply.
The equivalent circuit of the capacitor shown below is:
Due to initial condition, at t = 0 capacitor will act as a constant voltage source (at t = 0, capacitor acts as shortcircuit). Hence, option (d) is correct.
The strength of current in 1 Henry inductor changes at a rate of 1 A/sec. The magnitude of energy stored in the inductor after 3 sec is:
∴ Current in the inductor after 3 sec is:
1= 3 A
Hence, energy is stored after 3 sec:
The current and voltage profile of an element vs time has been shown in given figure. The element and its value are respectively:
Figure shown below exhibits the voltagetime profile of a source to charge a capacitor of 50 μF. The value of charging current in amperes is:
From given figure:
The equivalent capacitance across the given terminals AB is:
The charging time required to charge the equivalent capacitance between the given terminals ab by a steady direct current of constant magnitude of 10 A is given by:
Equivalent capacitance between terminals ab is:
An ac voltage of 220 V is applied to a pure inductance of 50 H. If the current is 5 A, the instantaneous value of voltage and current will be respectively given by:
Max. value of current:
Assuming voltage as the reference phasor:
The voltage and current through a circuit element is v= 100 sin (314 t + 45°) volts and i = 10 sin (314 t  45 ° ) amps.
The type of circuit element and its value will be respectively:
The phase difference between v and i is:
Since v leads i therefore, the circuit element is an inductor.
The equivalent inductance for the inductive circuit shown below at terminal “ 1  2 ” is:
Converting the internal star connected inductance to an equivalent delta, the circuit reduces as shown below.
Hence, equivalent circuit becomes as shown below.
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