Alternating Current questions
577 published questions with worked solutions.
- The peak value of alternating current is 5 2 A. The root-mean-square value of current will be
- If reading of an ammeter is 10 A, the peak value of current is
- The frequency of an alternating voltage is 50 cycles/s and its amplitude is 120 V. Then, the rms value of voltage is
- The average value of AC voltage given by V = V_m t over time interval t=0 to t= is
- An alternating voltage V(t)=220 100 t volt is applied to a purely resistive load of 50 , . The time taken for the current to rise...
- A pure inductor of inductance 25.0 mH is connected to a source of 220 V. Find the inductive reactance, if the frequency of the...
- The rms current in the circuit containing a pure inductor of 40 mH, connected to a source 200 V, 50 Hz is
- An inductance of negligible resistance, whose reactance is 120 at 200 Hz is connected to a 240 V, 60 Hz, power line. The current...
- An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the...
- The reactance of a coil when used in the AC power supply (220 V, 50 cycle s^ -1 ) is 50 . The inductance of the coil is nearly
- When a capacitor of 36 , F is connected to a 240 V, 50 Hz supply the currents (rms and peak) in the circuit are
- If the power factor changes from 12 to 14, then what is the increase in impedance in AC?
- In an electrical circuit R, L, C and an AC voltage source all connected in series. When L is removed from the circuit, the phase...
- The impedance of a circuit, when a resistance R and an inductor of inductance L are connected in series in an AC circuit of...
- An inductive coil has a resistance of 100 , . When an AC signal of frequency 1000 Hz is applied to the coil, the voltage leads...
- A resistance of 200 , and capacitor of 15 , F are connected in series to a 220 V, 50 Hz AC source. The voltage (rms) across the...
- The current in the series L-C-R circuit is
- A coil of 0.01 H inductance and 1 , resistance is connected to 200 V, 50 Hz AC supply. The impedance of the circuit and time lag...
- In an L-C-R circuit, if V is the effective value of the applied voltage, V_R is the voltage across R, V_L is the effective...
- A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when
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