List of top Physics Questions on Alternating current asked in COMEDK UGET

In the series L-C-R circuit shown, the impedance is

The instantaneous values of alternating current and voltages in a circuit given as
$$ i = \frac{1}{\sqrt{2}} \sin(100\pi t) \text{ amp} $$ $$ e = \frac{1}{\sqrt{2}} \sin(100\pi t + \pi/3) \text{ volt} $$ The average power (in watts) consumed in the circuit is
An alternating voltage \( V = 200\sin(100t) \) is applied to a series combination of \( R = 30\Omega \) and an inductor of \( 400 \, \text{mH} \). The power factor of the circuit is,
If impedance is \( \sqrt{3} \) times resistance, then find phase difference.
The mean or average value of $AC$ over a complete cycle is
As resistance in a series resonant circuit increases (i) sharpness of resonance decreases (ii) bandwidth increases
An inductor coil when connected to a $12 \, V$ batt.ery draws a steady current $6 \, A$. This coil when connected in series with a capacitor and an $AC$ source of $10 \, V$, current is in phase with applied voltage. $AC $ meter included in the circuit reads
Formation of Eddy currents has desirable effects in 1. Electromagnetic damping, 2. Transformer 3. Inductothermy
A step up transformer has turns ratio $10 : 1$. A source of emf 2 volts is fed to the primary. Secondary voltage developed is
A resistance wire of $72\,\Omega$ is connected across 120 V dc source. When a similar wire is connected in paralllel with the first wire, change in power dissipated is