MEDIUM
12th Odisha Board
IMPORTANT
Earn 100

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.

Important Questions on Alternating Currents

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.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 9
The current through a coil is 2A when connected to a 8V d.c supply. When the same coil is connected to a 15V a.c supply at 15Hz, the current is 3A. Find the resistance, impedance, inductive reactance, inductance and power factor of the coil.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 10
The input and output impedance of a transformer, which delivers 20W of power, are 1000 ohm and 8 ohm respectively. Calculate its turn ratio and the current and potential difference in the primary and secondary.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 11
The voltmeter reading across a 60Hz source of alternating emf 220 V. Write the equation of the instantaneous emf of the source. If it is connected across a 50 ohm resistor find the peak current in the circuit.
MEDIUM
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 12
A single circuit element is connected across a source of alternating emf given by V=100Vsin100πt.  Determine the circuit element if the current in the circuit is written as I=20Asin100πt+π2.
HARD
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Physics Class 12>Chapter 10 - Alternating Currents>MODEL QUESTIONS>Q 13
A 40 V, 500-cycle a.c source is connected to a series circuit containing a 5ohm resistor, a capacitive reactance of 4 ohm and a coil that has a resistance of 1.25 ohm and an inductive reactance of 12 ohm. Calculate the power and the power factor.