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Power In Ac Circuit Free Doubts and Solutions

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
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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
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CBSE - XII Science - Physics - Alternating Current

Define the term 'wattless current'.

Asked by Topperlearning User 22nd June 2015, 12:29 PM
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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
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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
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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
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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
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CBSE - XII Science - Physics - Alternating Current

In an ac circuit where is power dissipated?

Asked by Topperlearning User 22nd June 2015, 11:04 AM
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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
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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
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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
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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
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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
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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
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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
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CBSE - XII Science - Physics - Alternating Current

The Dielectric strength of air is 3*10V /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
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CBSE - XII Science - Physics - Alternating Current

Define the term 'wattles current'.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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