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CBSE - XII Science - Physics - Current Electricity

Can you please provide me the derivation for wheatstone bridge [R1/R2 = R3/R4] .......
Tomorrow I have my exams..........

Asked by pksunilnair 19th October 2017, 7:39 PM
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CBSE - XII Science - Physics - Current Electricity

explain Terminal potential potential dufference and its relaition with  e.m.f and internal resistance during discharging and charging

Asked by modi72879 31st May 2017, 9:23 PM
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CBSE - XII Science - Physics - Current Electricity

what do you understand by sensitiveness of potentiometer

Asked by vinodjoshi112233 29th May 2017, 10:46 AM
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CBSE - XII Science - Physics - Current Electricity

in spite of having  magnitude as well as direction , why the electric  current  is  a scalar quantity ?
pls explain  briefly .

Asked by ppratim02 19th August 2016, 7:47 PM
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CBSE - XII Science - Physics - Current Electricity

Q.1 WHY EMF OF MWIN CIRCUIT SHOULD ALWAYS BE GREATER THAN SECONDARY CIRCUITS ?
 

Asked by tajalanamdinkarmani4569 13th February 2016, 7:40 PM
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CBSE - XII Science - Physics - Current Electricity

three resistors 3ohms,4ohms,6ohms in parallel the combination is connected to a cell of a emf 2V internal resistance 2/3ohms.find current through different branches
 

Asked by Subhashree Lenka 28th August 2015, 10:40 AM
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CBSE - XII Science - Physics - Current Electricity

To study the variation in current flowing in a circuit containing an LDR beacuse of varation in
 
a) the power of the incardescent lamp used to illuminate the LDR (keeping all lamp at a fixed distance)
 
b)the distance of a incardescent lamp of fixed power used to illuminte the LDR

Asked by hasanali.ali986 19th May 2015, 3:58 PM
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CBSE - XII Science - Physics - Current Electricity

you have given a primary cell and a secondary cell of the same emf. From which cell will you be able to draw larger current and why?

Asked by justin 21st March 2015, 7:54 PM
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CBSE - XII Science - Physics - Current Electricity

A battery of emf 2.5 V and internal resistance r is connected in series with a resistor of 45 ohm through an ammeter of resistance of 1 ohm. The ammeter reads current of 50 mA. Draw the circuit diagram and calculate the value of r.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

What is the purpose of using a resistance in series during charging a circuit?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Why the light of a motor vehicle becomes dim when it is started?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

A battery of 10 V and internal resistance of 2 ohm is connected to a resistor R. Calculate the value of R, if the current in the circuit is 0.5 A. Also find the terminal voltage of the battery when the circuit is closed?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Differentiate between Emf and Potential difference of a cell.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

Under what condition, the terminal potential difference of a cell is greater than its emf.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Current Electricity

A resistance R is connected across a cell of emf ε and internal resistance r. A potentiometer now measures the potential difference between the terminals of the cell as V. Write the expression for 'r' in terms of ε, V and R.

Asked by Topperlearning User 23rd April 2014, 4:20 PM
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CBSE - XII Science - Physics - Current Electricity

A battery of emf 5 V and internal resistance of 0.5 ohm is connected across a resistance of 14.5 ohm. How many electrons pass through a cross-section of the resistance in 2 seconds?

Asked by Topperlearning User 23rd April 2014, 4:12 PM
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CBSE - XII Science - Physics - Current Electricity

The potential difference across a cell is 2 V when a current of 1 A is drawn from it. The potential difference falls to 1.8 V when a current of 1.2 A is drawn. Find the emf and internal resistance of the cell.

Asked by Topperlearning User 22nd April 2014, 5:16 PM
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CBSE - XII Science - Physics - Current Electricity

A cell of emf 8 V and internal resistance of 0.5 ohm is connected across a load of resistance (i) 15.5 ohm (ii) 11.5 ohm. Calculate the potential drop in each case.

Asked by Topperlearning User 22nd April 2014, 4:50 PM
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CBSE - XII Science - Physics - Current Electricity

What do you know about the internal resistance of the cell? On what factors does it depend?

Asked by Topperlearning User 22nd April 2014, 4:39 PM
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