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CBSE - XII Science - Physics - Alternating Current
tan Phi = XL-XC/R, what is Tan Phi called here
Asked by sky11841
8th September 2021,
10:04 PM
CBSE - XII Science - Physics - Alternating Current
Please tell me which are the important derivations from each chapter to learn for board exam.
Asked by sunil2791
1st November 2017,
10:05 PM
CBSE - XII Science - Physics - Alternating Current
Please solve this numerical?
Asked by Anshul
6th August 2017,
10:01 AM
CBSE - XII Science - Physics - Alternating Current
Please solve this numerical of physics
Asked by Anshul
6th August 2017,
9:58 AM
CBSE - XII Science - Physics - Alternating Current
A pure inductor of 25 mili Henry is connected to source of 220 volt Find inductive resistor and Irms if frequency is 50 Hz?
Asked by Anshul
6th August 2017,
9:49 AM
CBSE - XII Science - Physics - Alternating Current
A 100Hz Ac is flowing in a 14 mili Henry coil.Find Its resistance?
Asked by Anshul
6th August 2017,
9:46 AM
CBSE - XII Science - Physics - Alternating Current
1. X = R
2. X >> R
3. X << R
4. X = infinity
Please state reason as well
Asked by rajeshtitu
14th July 2016,
9:13 PM
CBSE - XII Science - Physics - Alternating Current
Respected Sir/Mam,
I would like to know what difference does it cause,whether current or voltage reaches first to an electrical appliance.
In both the cases,the electrical instrument will work,right??
Thanks in advance.
Asked by shiva
16th November 2015,
3:22 PM
CBSE - XII Science - Physics - Alternating Current
You are given three circuit elements X, Y and Z. When the element X is connected across an a.c. source of a given voltage, the current and the voltage are in the same phase. When the element Y is connected in series with X across the source, voltage is ahead of the current in phase by. But the current is ahead of the voltage in phase bywhen Z is connected in series with X across the source. Identify the circuit elements X, Y and Z. When all the three elements are connected in series across the same source, determine the impedance of the circuit. Draw a plot of the current versus the frequency of applied source and mention the significance of this plot.
Asked by Topperlearning User
8th July 2015,
2:38 PM
CBSE - XII Science - Physics - Alternating Current
In a series LCR circuit, VL = VC ≠ VR. What is the value of power factor?
Asked by Topperlearning User
8th July 2015,
11:23 AM
CBSE - XII Science - Physics - Alternating Current
Prove that an ideal capacitor, in an a.c. circuit does not dissipate power. Or Derive an expression of the impedance of an ac circuit consisting of an inductor and a resistor.
Asked by Topperlearning User
22nd June 2015,
12:47 PM
CBSE - XII Science - Physics - Alternating Current
The given circuit diagram shows a series LCR circuit connected to a variable frequency 230 V source: (a) Determine the source frequency, which drives the circuit in resonance. (b) Obtain the impedance of the circuit and the amplitude of current at the resonating frequency. (c) Determine the rms potential drops across the three elements of the circuit. (d) How do you explain the observation that the algebraic sum of the voltage of the three elements obtained in (c) is greater than the supplied voltage? OR The primary coil of an ideal step-up transformer has 100 turns and the transformation ratio is also 100. The input voltage and the power are 220 V and 1100 W respectively. Calculate: (i) number of turns in the secondary (ii) the current in the primary (iii) voltage across the secondary (iv) the current in the secondary (v) power in the secondary
Asked by Topperlearning User
22nd June 2015,
12:45 PM
CBSE - XII Science - Physics - Alternating Current
Match the following quantities using the analogy between mechanical and electrical quantities. (i) Mass (M) Charge (q) (ii) Force Constant (k) Resistance (R) (iii) Displacement (x) Max. charge stored (q) (iv) Velocity (v) Inductance (L) (v) Amplitude of forced oscillation (A) Reciprocal ofcapacitance (1/C) (vi) Damping constant (b) Current (i)
Asked by Topperlearning User
22nd June 2015,
12:34 PM
CBSE - XII Science - Physics - Alternating Current
A resistor of 200 Ω and a capacitor of 15.0 μF are connected in series to 220 V, 50 Hz ac source. Calculate the current in the circuit and the rms voltage across the resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage ? If yes, resolve the paradox
Asked by Topperlearning User
22nd June 2015,
11:31 AM
CBSE - XII Science - Physics - Alternating Current
In a series LCR circuit, the voltage across an inductor, a capacitor and a resistor are 30 V, 30 V and 60 V respectively. What is the phase difference between the applied voltage and current in the circuit ?
Asked by Topperlearning User
22nd June 2015,
11:24 AM
CBSE - XII Science - Physics - Alternating Current
a resistor of 30 Ω and a capacitor of 0.25 μF are connected in series to a 100 V source (ω=10,000 rad/sec). Find the current in the circuit and the rms voltage across the resistor and the capacitor. Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox.
Asked by Topperlearning User
22nd June 2015,
11:20 AM
CBSE - XII Science - Physics - Alternating Current
A resistor of 12 Ω and inductance 2 H are connected in series to a 220 V, 50 Hz a.c. source. Find the total impedance of LR circuit.
Asked by Topperlearning User
22nd June 2015,
10:35 AM
CBSE - XII Science - Physics - Alternating Current
What is Q factor of series resonant circuit and what will happen to the Q factor if the resistance increases?
Asked by Topperlearning User
22nd June 2015,
10:23 AM
CBSE - XII Science - Physics - Alternating Current
Find the series resonance frequency for a circuit when L = 0.1 H and C = 10 F.
Asked by Topperlearning User
22nd June 2015,
10:18 AM
CBSE - XII Science - Physics - Alternating Current
In a circuit a coil of resistance 100 Ω and inductance 0.1 H are connected across an ac voltage of frequency 100/2π Hz. What is the phase difference?
Asked by Topperlearning User
22nd June 2015,
10:15 AM
CBSE - XII Science - Physics - Alternating Current
Find the phase angle for RLC circuit with XC = 14 and XL = 30 and R = 10
Asked by Topperlearning User
22nd June 2015,
10:12 AM
CBSE - XII Science - Physics - Alternating Current
In a RLC circuit R = 10 Ω , L = 0.1 H , XC = 12 Ω are joined across 200 V 50 Hz a.c. supply. Calculate its impedance.
Asked by Topperlearning User
22nd June 2015,
10:10 AM
CBSE - XII Science - Physics - Alternating Current
What is impedance?
Asked by Topperlearning User
22nd June 2015,
10:02 AM
CBSE - XII Science - Physics - Alternating Current
What is reactance and susceptance?
Asked by Topperlearning User
22nd June 2015,
9:59 AM
CBSE - XII Science - Physics - Alternating Current
In a series RC circuit, R = 30 Ω, C = 0.25 μF, V = 100 V and ω = 1,00,000 rad /s. Find the current in the circuit and calculate the voltage across the resistor and the capacitor.
Asked by Topperlearning User
22nd June 2015,
8:41 AM
CBSE - XII Science - Physics - Alternating Current
derive LCR circuit also resonance in it
Asked by mahesh.kala
17th November 2014,
7:27 PM
CBSE - XII Science - Physics - Alternating Current
Describe briefly, with the help of a labelled diagram, the basic elements of an A.C. generator. State its underlying principle. Show diagrammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field. Write the expression for the instaneous value of the emf induced in the rotating loop. Or A series LCR circuit is connected to an source having voltage v = vm sin . Derive the expression for the instantaneous current I and its phase relationship to the applied voltage. Obtain the condition for resonance to occur. Define 'power factor'. State the conditions under which it is (i) maximum and (ii) minimum.
Asked by Topperlearning User
4th June 2014,
1:23 PM
