Alternating Cur...

An inductance of negligible resistance whose reactance is $$22\Omega$$ at $$200Hz$$ is connected to $$200$$volt. If the line frequency is known to be $$50$$ cycles/second, the equation for the line voltage is :

In series combination of $$R,L,C$$ with an A.C source at resonanace, if $$R=20$$ ohm, then impedence $$Z$$ of the combination is

For the circuit shown in the fig., the current through the inductor is $$0.9A$$ while the current through the condenser is $$0.4A$$. Then

In a pure capacitive A.C circuit current and voltage differ in phase by

In a RLC circuit capacitance is changed from $$C$$ to $$2C$$. For the resonant frequency to remain unchanged, the inductance should be changed from $$L$$ to

If the frequency of an A.C is made 4 times of its initial value, the inductive reactance will

If a current $$I$$ given by $$I={ I }_{ 0 }\sin { \left( \omega t-\pi /2 \right)  } $$ flows in inductance in an AC circuit which an A.C potential $$E={ E }_{ 0 }\sin{\omega t}$$ has been applied, then power consumption $$P$$ in the circuit will be

In series $$L-C-R$$ circuit, the voltages across $$R, L$$ and $$C$$ are $${V}_{R}, {V}_{L}$$ and $${V}_{C}$$ respectively. Then the voltage of applied a.c. source must be

Resonance frequency of LCR series a.c. circuit is $${f}_{0}$$. Now the capacitance is made $$4$$ times, then the new resonance frequency will become

The AC produced in India changes its direction in every :