Alternating Current questions
577 published questions with worked solutions.
- A 12 V, 60 W lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of 220 V....
- In a series LCR circuit, the inductance L is 10 mH, capacitance C is 1 and resistance R is 100 . The frequency at which resonance...
- A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in...
- A series LCR circuit containing 5.0 H inductor, 80 capacitor and 40 resistor is connected to 230 V variable frequency ac source....
- A capacitor of reactance 4√3 Ω and a resistor of resistance 4Ω are connected in series with an ac source of peak value 8√2 V. The...
- When a coil is connected across a 20 V dc supply, it draws a current of 5 A. When it is connected across 20 V, 50 Hz ac supply,...
- Primary side of a transformer is connected to 230 V, 50 Hz supply. Turns ratio of primary to secondary winding is 10 : 1. Load...
- A series LCR circuit with L = 100 mH, C = 10^ -3 F and R = 10 Ω, is connected across an ac source of 220 V, 50 Hz supply. The...
- In an a.c. circuit voltage and current are given by : V = 100 sin (100t) V and I = 100 sin(100t + π/3) mA respectively. The...
- A power transmission line feeds input power at 2.3 kV to a step-down transformer with its primary winding having 3000 turns. The...
- A series L.R circuit connected with an ac source E = (25 sin 1000 t) V has a power factor of 1/√2. If the source of emf is...
- An AC voltage V = 20 sin 200πt is applied to a series LCR circuit which drives a current I = 10 sin(200πt + π/3). The average...
- A sinusoidal voltage of peak value 250 V is applied to a series LCR circuit, in which R = 8 , L = 24 mH and C = 60 . The value of...
- Match List-I with List-II : List-I: (a) Phase difference between current and voltage in a purely resistive AC circuit (b) Phase...
- What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved ?
- An AC current is given by I = I_1 t+I_2 t. A hot wire ammeter will give a reading :
- In a series LCR circuit, the inductive reactance (X_L) is 10 and the capacitive reactance (X_C) is 4 . The resistance (R) in the...
- In a series LCR resonance circuit, if we change the resistance only, from a lower to higher value :
- An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms...
- For a series LCR circuit with R = 100 , L = 0.5 mH and C = 0.1 pF connected across 220 V–50 Hz AC supply, the phase angle between...
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