UrbanPro

Your Worksheet is Ready

CBSE - Class 12 Physics Alternating Current Worksheet

EXERCISES

1.
(a) The peak voltage of an ac supply is $300 V$. What is the rms voltage?
2.
(b) The rms value of current in an ac circuit is $10 A$. What is the peak current?
3.
Obtain the resonant frequency (\omega_{r}) of a series LCR circuit with (L = 2.0H), (C = 32 \mu F) and (R = 10 \Omega). What is the Q-value of this circuit?
4.
What is the net power absorbed by each circuit over a complete cycle. Explain your answer.
5.
A $60 \mu F$ capacitor is connected to a $110 V$, $60 Hz$ ac supply. Determine the rms value of the current in the circuit.
6.

Figure 7.21 shows a series LCR circuit connected to a variable frequency 230 V source. (L = 5.0 H), (C = 80\mu F), (R = 40 \Omega). Determine the source frequency which drives the circuit in resonance.

7.

Figure 7.21 shows a series LCR circuit connected to a variable frequency 230 V source. (L = 5.0 H), (C = 80\mu F), (R = 40 \Omega). Obtain the impedance of the circuit and the amplitude of current at the resonating frequency.

8.

A 44 mH inductor is connected to 220 V, 50 Hz ac supply. A 60 mF capacitor is connected to a 110 V, 60 Hz ac supply. what is the net power absorbed by each circuit over a complete cycle. Explain your answer.

9.
A charged $30 \mu F$ capacitor is connected to a $27 mH$ inductor. What is the angular frequency of free oscillations of the circuit?
10.
A (100 \Omega) resistor is connected to a 220 V, 50 Hz ac supply. What is the net power consumed over a full cycle?
11.
A (100 \Omega) resistor is connected to a 220 V, 50 Hz ac supply. What is the rms value of current in the circuit?
12.
A series LCR circuit with $R = 20 \Omega$, $L = 1.5 H$ and $C = 35 \mu F$ is connected to a variable-frequency $200 V$ ac supply. When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle?
13.

Figure 7.17 shows a series LCR circuit connected to a variable frequency $230 V$ source. $L = 5.0 H$, $C = 80\mu F$, $R = 40 \Omega$. (b) Obtain the impedance of the circuit and the amplitude of current at the resonating frequency.

14.
A $100 \Omega$ resistor is connected to a $220 V$, $50 Hz$ ac supply.
(a) What is the rms value of current in the circuit?
15.
The rms value of current in an ac circuit is 10 A. What is the peak current?
16.

Figure 7.17 shows a series LCR circuit connected to a variable frequency $230 V$ source. $L = 5.0 H$, $C = 80\mu F$, $R = 40 \Omega$. (c) Determine the rms potential drops across the three elements of the circuit. Show that the potential drop across the LC combination is zero at the resonating frequency.

17.
The peak voltage of an ac supply is 300 V. What is the rms voltage?
18.
A $44 mH$ inductor is connected to $220 V$, $50 Hz$ ac supply. Determine the rms value of the current in the circuit.
19.
A radio can tune over the frequency range of a portion of MW broadcast band: (800 kHz to 1200 kHz). If its LC circuit has an effective inductance of 200 (\mu H), what must be the range of its variable capacitor?
[Hint: For tuning, the natural frequency i.e., the frequency of free oscillations of the LC circuit should be equal to the frequency of the radiowave.]
20.

Figure 7.17 shows a series LCR circuit connected to a variable frequency $230 V$ source. $L = 5.0 H$, $C = 80\mu F$, $R = 40 \Omega$. (a) Determine the source frequency which drives the circuit in resonance.

Worksheet Answers

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All