Alternating Current questions
577 published questions with worked solutions.
- The r. m. s. value of an A.C. of 50 Hz is 10 A. The time taken by the alternating current in reaching from zero to maximum value...
- A hot wire ammeter reads 10 A in A.C. circuit. The peak value of the current is
- A 20 volt A.C. is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across...
- The instantaneous current in a circuit is, I= ( t+ ) ampere. What is the r.m.s. value of the current?
- The instantaneous values of current and e. m. f. in an A.C. circuit are I= 1 2 (314t) A and e= 2 (314t- 6 ) V respectively. The...
- An alternating e. m. f. of 100 V (rms) is applied to a series LCR circuit. At resonance, the potential difference across the...
- A 10 capacitor is connected across a 200 V, 50 Hz A.C. supply. The peak current through the circuit is
- The inductive reactance of a coil is 1000 . If its inductance and the frequency of A.C. supply are both doubled, then the...
- In a series A.C. circuit, R=100 , X_L=300 and X_C=200 . The phase difference between the applied e. m. f. and the current will be
- A resistance of 10 , an inductance of ( 2 ) henry and a capacitor of ( 1 ) are connected in series with mains line of 110 V and...
- An inductive coil has a resistance of 100 . When an A.C. source of frequency 1000 Hz is applied across the coil, the applied...
- A variable capacitor and an inductive coil with negligible resistance are connected in series to an A.C. voltage of value 100 V....
- It is found that the current in the circuit is 0.50 A with D.C. and 0.40 A with A.C. source. The voltage E for D.C. is 120 V and...
- A series RLC circuit has the following values R=20 , X_L=10 , E=50 V (rms) at =400 rad/s. Current 2 A leads the applied voltage....
- When 100 V D.C. flows in a solenoid, the current is 1.0 A. When 100 V A.C. flows, the current drops to 0.5 A. If the frequency of...
- The e. m. f. and the current of an A.C. circuit are e=5 t volt and I=2 t ampere respectively. The power consumed in the circuit is
- When a coil connected to a D.C. source of e.m.f. 12 volt, then a current of 4 ampere flows in it. If the same coil is connected...
- The r.m.s. current in an A.C. circuit is 2 A. If the wattless current be 3 A, what is the power factor?
- 2.5 F capacitor and 3000 ohm resistance are joined in series to an A.C. source of 200 volt and 50 s^ -1 frequency. The power...
- Power factor in an A.C. mains is 1 2 in a series RL circuit. If R = 100 then L is
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