Alternating Current Overview

Power factor of series LCR circuit at resonance is

An electric bulb and a capacitor are connected in series with an AC source. On increasing the frequency of the source, the brightness of the bulb:

A direct current of 4 A and an alternating current of 4 A flows through two identical resistors. The ratio of heat produced in the two resistances in same time interval will be

The value of alternating emf (E) in the given circuit will be

Figure shows a circuit that contains four identical resistors with resistance R = $2.0\Omega ,$  two identical inductors with inductance L = 2.0mH and an ideal battery with emf E = 9V. The current 'i' just after switch 'S' is closed will be:

An inductor of 0.5 mH, a capacitor of 200 $\mu F$ and a resistor of 2 $\Omega$  are connected in series with a 220V ac source. If the current is in phase with the emf, the frequency of ac source will be__________ * 10² Hz.

An inductor and a resistor are connected to an ac supply of 120 V, 50 Hz. The resistance of the resistor is 20Ω. If the voltages leads the current by a phase difference of 45°, find the inductance of the inductor.

An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance ' R' are connected in series to an ac source of potential difference ' V volts as shown in figure. Potential difference across L, C and R is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through LCR series circuit is 10√2 A. The impedance of the circuit is:

In a series LCR circuit, the inductive reactance (X?) is 10 Ω, and the capacitive reactance (Xc) is 4 Ω. The resistance (R) in the circuit is 6 Ω. The power factor of the circuit is :

An AC current is given by I = I₁sinωt + I₂cosωt. A hot wire ammeter will give a reading: