MEDIUM
12th Odisha Board
IMPORTANT
Earn 100

Deduce an expression for the power of an a.c circuit containing an inductance. Explain what is power factor in the purely inductive circuit.

Important Questions on Alternating Currents

MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 1
Alternating current in a circuit is given by I=50sin400πt. Find the frequency and the RMS value of the current.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 2
A circuit has an inductance of 12π henry and resistance of 500ohms. If an a.c. of frequency 50 c.p.s is applied to it, find reactance and the impedance of the circuit.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 3
Calculate the capacitance of a capacitor to run a 120V, 100W lamp connected in series with an a.c. mains of 220 volt having frequency 50Hz.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 4
A 60Hz a.c. circuit has a voltage of 120 volts and current of 6 amp. (effective values). Find the maximum values of these quantities. What is the instantaneous value of the voltage 1720 sec. after the voltage has zero value?
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 5
A coil which takes 10 amps from 20 volt d.c. the circuit takes 3 amp from a 120volt, 60 cycle line. Find the resistance, inductive reactance and inductance of the coil.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 6
A coil takes 3 amps and 108 watts from a 120 volts, 60 cycle line. Find what are its resistance and inductive reactance.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 7
The resistance in a certain 220 volt 60 cycle a.c. a series circuit is 82.4 ohms and the capacitive reactance is 60 ohm. Find the total impedance. Calculate the current in the circuit and the capacitance.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 8
At which frequency of a.c will the inductive reactance of a 20 mh inductor be equal to the capacitive reactance of a 20μF capacitor? Calculate.