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CBSE - XII Science - Physics - Alternating Current
The value of instantaneous voltage received from a.c. source is given by following equation, V = 200-√2 sin 314t volt, then find the root mean square value of the source?
Asked by divyanshsahu109
11th March 2024,
5:57 PM
CBSE - XII Science - Physics - Alternating Current
A motor drill draws 3.5 A current at the power line voltage 120 V(RMS). What is the motor's power if the current lags the voltage by 20 degrees?
Asked by arjunsah797
29th March 2022,
7:25 AM
CBSE - XII Science - Physics - Alternating Current
A series LCR circuit with a 100 ohm resistor dissipates 80 W when attached to a 120 V, 60 Hz power line. What is the power factor?
Asked by arjunsah797
27th March 2022,
8:00 PM
CBSE - XII Science - Physics - Alternating Current
The required no-load ratio in a 1 -phase 50 Hz core type transformer is 6000/250 V. Find the no. of turns in each winding if the flux is to be about 0.06 wbs.
Asked by saivardhanreddy15022003
11th March 2022,
6:47 PM
CBSE - XII Science - Physics - Alternating Current
a horizontal straight wire 10m long extending from east to west is falling with a speed of 5m/s at right angles to the horizontal component of the earth magnetic field 0.30
Asked by a_k_garg
11th October 2020,
10:38 AM
CBSE - XII Science - Physics - Alternating Current
Prove that an ideal inductor does not dissipate power in an A.C circuit.
Asked by rishicool0205
19th August 2020,
2:20 PM
CBSE - XII Science - Physics - Alternating Current
The power factor varies between………………
Asked by rajneetverma11
16th February 2020,
4:42 PM
CBSE - XII Science - Physics - Alternating Current
What are the imp. conceptual questions from the chapter Alternating Current & EMI?
Is power factor at resonance is zero. How?
Asked by debjyotisaha98
19th August 2015,
10:23 PM
CBSE - XII Science - Physics - Alternating Current
Given below are two electric circuits A and B Calculate the ratio of power factor of the circuit B to the power factor of circuit A.
Asked by Topperlearning User
22nd June 2015,
12:46 PM
CBSE - XII Science - Physics - Alternating Current
Define the term 'wattless current'.
Asked by Topperlearning User
22nd June 2015,
12:29 PM
CBSE - XII Science - Physics - Alternating Current
Prove that an ideal capacitor in an a.c. circuit does not dissipate power.
Asked by Topperlearning User
22nd June 2015,
11:25 AM
CBSE - XII Science - Physics - Alternating Current
Define power factor. State the conditions under which it is (i) maximum and (ii) minimum.
Asked by Topperlearning User
22nd June 2015,
11:22 AM
CBSE - XII Science - Physics - Alternating Current
State the factors on which the power factor depends?
Asked by Topperlearning User
22nd June 2015,
11:07 AM
CBSE - XII Science - Physics - Alternating Current
In a circuit a 75 Ω resistance and 1 H coil have peak voltage of 3 V 50 Hz frequency. Calculate the current and the power.
Asked by Topperlearning User
22nd June 2015,
11:06 AM
CBSE - XII Science - Physics - Alternating Current
In an ac circuit where is power dissipated?
Asked by Topperlearning User
22nd June 2015,
11:04 AM
CBSE - XII Science - Physics - Alternating Current
Prove that, a pure inductive circuit does not consume any power in a complete cycle.
Asked by Topperlearning User
22nd June 2015,
11:03 AM
CBSE - XII Science - Physics - Alternating Current
A 100 Ω iron is connected to a 200 V supply with 50 Hz frequency. Find the rms value of current and the net power consumed over full cycle.
Asked by Topperlearning User
22nd June 2015,
11:02 AM
CBSE - XII Science - Physics - Alternating Current
How can the power factor be improved by using capacitance of appropriate value?
Asked by Topperlearning User
22nd June 2015,
11:01 AM
CBSE - XII Science - Physics - Alternating Current
Is it possible to obtain wattless current in a circuit?
Asked by Topperlearning User
22nd June 2015,
10:59 AM
CBSE - XII Science - Physics - Alternating Current
On what factors does power in an ac circuit depend?
Asked by Topperlearning User
22nd June 2015,
10:58 AM
CBSE - XII Science - Physics - Alternating Current
The voltage and current in an ac circuit is given by What is the power dissipated?
Asked by Topperlearning User
22nd June 2015,
10:57 AM
CBSE - XII Science - Physics - Alternating Current
What will be the phase difference between the voltage and the current given power factor of an ac circuit is 0.5?
Asked by Topperlearning User
22nd June 2015,
10:57 AM
CBSE - XII Science - Physics - Alternating Current
an alternating potential V=Vo sin
t is applied across a circuit .as a result the current I=Io sin(t-
/2) flow in it.the power consumed in the circuit per cycle is?(ans.zero)
t is applied across a circuit .as a result the current I=Io sin(t-/2) flow in it.the power consumed in the circuit per cycle is?(ans.zero)
Asked by Nidhi
30th December 2014,
11:54 PM
CBSE - XII Science - Physics - Alternating Current
The Dielectric strength of air is 3*106 V /m. A parallel plate capacitor has area 20cm2 and plate separation of 0.1mm. Find the maximum rms voltage of an A/C source which can be safely connected to this capacitor.
Asked by Malavika Umesh
29th September 2014,
8:49 PM
CBSE - XII Science - Physics - Alternating Current
Define the term 'wattles current'.
Asked by Topperlearning User
4th June 2014,
1:23 PM
