Alternating Current Circuits
Physics ⇒ Electricity and Magnetism
Alternating Current Circuits starts at 11 and continues till grade 12.
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A 100 Ω resistor, a 0.5 H inductor, and a 10 μF capacitor are connected in series to a 220 V, 50 Hz AC supply. Calculate the impedance of the circuit.
A 60 W, 120 V lamp is to be used on a 240 V, 50 Hz AC supply. What value of resistance should be connected in series with the lamp?
A coil of inductance 0.2 H and resistance 20 Ω is connected to a 220 V, 50 Hz AC supply. Calculate the inductive reactance.
A transformer has 500 turns in the primary and 100 turns in the secondary. If the input voltage is 220 V, what is the output voltage?
A 100 Ω resistor, a 0.5 H inductor, and a 10 μF capacitor are connected in series to a 220 V, 50 Hz AC supply. Calculate the impedance of the circuit.
A 60 W, 120 V lamp is to be used on a 240 V, 50 Hz AC supply. What value of resistance should be connected in series with the lamp?
A coil of inductance 0.2 H and resistance 20 Ω is connected to a 220 V, 50 Hz AC supply. Calculate the inductive reactance.
A transformer has 500 turns in the primary and 100 turns in the secondary. If the input voltage is 220 V, what is the output voltage?
In a series LCR circuit at resonance, the impedance is equal to:
(1) R
(2) Lω
(3) 1/Cω
(4) Zero
In an AC circuit containing only a pure resistor, the current and voltage are:
(1) In phase
(2) Out of phase by 90°
(3) Out of phase by 180°
(4) Out of phase by 45°
Which of the following devices is used to measure the rms value of alternating current?
(1) Moving coil galvanometer
(2) Hot-wire ammeter
(3) Ballistic galvanometer
(4) Tangent galvanometer
Which of the following is NOT a unit of reactance?
(1) Ohm
(2) Henry
(3) Ω
(4) None of these
The average power consumed in a purely inductive or capacitive AC circuit is ________.
The main function of a choke coil in an AC circuit is to ________.
The phase difference between the current and voltage in a purely capacitive AC circuit is ________.
The power factor in an AC circuit is defined as ________.
True or False: In a purely inductive AC circuit, the current lags the voltage by 90 degrees.
True or False: In a purely resistive AC circuit, the power factor is unity.
True or False: The impedance of a series LCR circuit at resonance is minimum.
True or False: The rms value of an alternating current is always less than its peak value.
