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CBSE - XII Science - Physics - Current Electricity
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Asked by guptakartikgupta2
16th July 2022,
5:23 PM
CBSE - XII Science - Physics - Current Electricity
in Current electricity, in section batteries and EMF, we studied that,in a battery a internal mechanism exerts forces on the charges of battery... sir can you please explain, how this force drives the charge in a battery and why these forces drive charges in that manner? please explain sir..
Asked by yashrajgharte24.12dgatl
18th August 2021,
9:29 PM
CBSE - XII Science - Physics - Current Electricity
What is potential gradient along the wire Reading of voltmeter
Asked by diyasinha1701
31st July 2021,
9:58 AM
CBSE - XII Science - Physics - Current Electricity
pls solve
Asked by sulaikhasulu393
29th April 2020,
5:17 PM
CBSE - XII Science - Physics - Current Electricity
A battery of end E and internal resistance r is used in a circuit with a variable external resistance R. Find the value of R for which the power consumed in R is maximum.
Asked by prakriti12oct
28th July 2019,
11:07 PM
CBSE - XII Science - Physics - Current Electricity
By using the graph of terminal potential difference with external resistance how can we find internal resistance
Asked by rejimoljohn123
1st January 2019,
9:08 PM
CBSE - XII Science - Physics - Current Electricity
A 9 V battery is connected in series with a resistor .The terminal voltage is found to be 8 V. Current through the circuit is measured as 5 A. What is the internal resistance of the battery?
Asked by ayushmittal2424
9th December 2018,
9:45 PM
CBSE - XII Science - Physics - Current Electricity
Establish the expression for current flowing through an external resistance R connected to a cell of e.m.f. E and internal resistance r.
Asked by sd2021667
2nd December 2018,
9:09 PM
CBSE - XII Science - Physics - Current Electricity
Draw a circuit diagram for the comparying of emf of two primary cell using a potentiometer
Asked by rohitbansal39295
15th November 2018,
9:00 PM
CBSE - XII Science - Physics - Current Electricity
two cells of voltage 10 v and 2 v and internal resistances of 10ohm and 5 ohm respectively, are connected in parallel with positive end of 10v battery connected to negative pole of 2v battery.find the effective voltage and effective internal resistance of the combination.
Asked by my3shyll
24th September 2018,
7:33 PM
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..........
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
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
CBSE - XII Science - Physics - Current Electricity
what do you understand by sensitiveness of potentiometer
Asked by vinodjoshi112233
29th May 2017,
10:46 AM
CBSE - XII Science - Physics - Current Electricity
A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation:
(i)without any external resistance in the circuit
(ii)with resistance R1 only
(iii)with Ri and R2 in series combination
(iv)with R1 and R2 in parallel combination
The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.
Asked by Abinash Basistha
18th January 2017,
4:00 PM
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
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
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
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
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
CBSE - XII Science - Physics - Current Electricity
A cell of emf E and internal resistance r is connected to two external resistances R1 and R2 and a perfect ammeter. The current in the circuit is measured in four different situations: (i) Without any external resistance in the circuit (ii) with resistance R1 only (iii) With R1 and R2 in series combination (iv) with R1 and R2 in parallel combination The currents measured in the four cases are 0.42 A, 1.05A, 1.4 A and 4.2A, but not necessarily in that order. Identify the current corresponding to the four cases mentioned above.
Asked by Topperlearning User
1st July 2014,
3:44 PM
CBSE - XII Science - Physics - Current Electricity
What does Voltage basically mean? physically what does it mean? i am not able to understand. like current means flow of charges. what does voltage actually mean? i dont want the definition. i want to know what it actually means? and also difference between emf & voltage & potential difference & potential drop?
Asked by Abhishek Wagle
24th June 2014,
5:50 PM
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
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
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
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
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
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
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
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
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
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
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
