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Ac Applied Across Resistor Free Doubts and Solutions

CBSE - XII Science - Physics - Alternating Current

1.What is a rmf value of A.C.?Why do we need it?

Asked by Prakash 17th November 2017, 11:34 PM
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CBSE - XII Science - Physics - Alternating Current

a resistance of 40ohm is connected to an ac circuit of 220v 50Hz.find the time taken by the current to change from its maximum value to the rms value.

Asked by vasturushi 7th August 2017, 8:01 PM
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CBSE - XII Science - Physics - Alternating Current

Explain in detail how physiology of bird causes this?? How current flows in opp. Direction

Asked by upmaniousagarika 22nd July 2016, 11:42 AM
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CBSE - XII Science - Physics - Alternating Current

ac's shock repulsive or attractive?? Why plz explain

Asked by upmaniousagarika 22nd July 2016, 11:35 AM
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CBSE - XII Science - Physics - Alternating Current

Which is more dangerous ac [6/3, 5:04 PM] Gautam: Okay
[6/3, 5:04 PM] Gautam: Bye
[6/3, 5:04 PM] Gautam: 😘😘😊or dc ?? Whose shock is repulsive?? Ac's or dc's??? Why???   

Asked by upmaniousagarika 19th July 2016, 11:16 PM
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CBSE - XII Science - Physics - Alternating Current

When a bird sits on a high power line induced current flows through
Wings of bird in opposite direction due to which they feel a sense of repulsion 
And bird flies away. Why induced current flows in opp. Direction in wings of bird??
And how??

Asked by upmaniousagarika 16th July 2016, 10:15 PM
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CBSE - XII Science - Physics - Alternating Current

Distinguish between the terms 'average value' and 'rms value' of an alternating current.The instantaneous current from an a.c. source is  ampere.What are the average and rms values of the current?

Asked by Topperlearning User 22nd June 2015, 12:52 PM
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CBSE - XII Science - Physics - Alternating Current

why an ordinary moving coil ammeter used for dc cannot be used to measure alternating current ?

Asked by Topperlearning User 22nd June 2015, 11:23 AM
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CBSE - XII Science - Physics - Alternating Current

What is the phase difference between E and I in a a.c. circuit with (a)Resistance only (b)Inductor only (c)Capacitance only

Asked by Topperlearning User 22nd June 2015, 9:13 AM
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CBSE - XII Science - Physics - Alternating Current

What is the power of an electric kettle of 175 Ω when connected to 220 V and 50 Hz power supply?

Asked by Topperlearning User 22nd June 2015, 9:12 AM
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CBSE - XII Science - Physics - Alternating Current

Find the virtual current given the r.m.s voltage is 220 V for 100 Ω resistance?

Asked by Topperlearning User 22nd June 2015, 9:07 AM
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CBSE - XII Science - Physics - Alternating Current

What will be the reading of an ammeter for a moving coil ammeter with peak value of 6 A?

Asked by Topperlearning User 22nd June 2015, 9:00 AM
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CBSE - XII Science - Physics - Alternating Current

What will be the reading of an ammeter for an a.c. with peak value of 6 A?

Asked by Topperlearning User 22nd June 2015, 8:59 AM
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CBSE - XII Science - Physics - Alternating Current

An electrical appliance of 120 Ω is connected to 220 V, 50 cycles a.c.? Calculate the average potential difference?

Asked by Topperlearning User 22nd June 2015, 8:58 AM
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CBSE - XII Science - Physics - Alternating Current

What is the r.m.s. voltage when the peak voltage of an a.c. supply is 350 V?

Asked by Topperlearning User 22nd June 2015, 8:53 AM
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CBSE - XII Science - Physics - Alternating Current

What are hot wire instruments?

Asked by Topperlearning User 22nd June 2015, 8:48 AM
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CBSE - XII Science - Physics - Alternating Current

Draw the phasor diagrams for a.c circuit with resistor, inductor and capacitor

Asked by Topperlearning User 22nd June 2015, 8:43 AM
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CBSE - XII Science - Physics - Alternating Current

What is a phasor diagram?

Asked by Topperlearning User 22nd June 2015, 8:42 AM
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CBSE - XII Science - Physics - Alternating Current

what derive ac derivation
 

Asked by Santosh 12th January 2015, 11:18 PM
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CBSE - XII Science - Physics - Alternating Current

Two resistors ,6 ohm and R ohm are connected in series across an AC source of 5V.Th e potential difference across 6 ohm resistor is 3V.If the resistor R is repalced by a pure inductor of such magnitude that the value of current remains the same,then what is the voltage across the inductor?

Asked by Malavika Umesh 1st October 2014, 9:19 AM
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CBSE - XII Science - Physics - Alternating Current

What is the real meaning of phase. I had a problem while deriving phase relationship between e.m.f and current. Please tell me practical meaning of phase with an easy example.
I will be highly obliged.

Asked by shaktiisgreat000 5th September 2014, 5:15 PM
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