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Current Given By A Cell - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

Quick Facts

  • Current Given by a Cell is considered one the most difficult concept.

  • 14 Questions around this concept.

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QuestionMEDIUM

 A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of 1\Omega. The battery terminals are connected to an external resistance ‘R’. The minimum value of ‘R’, so that a current passes through the battery to charge it is :

 

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A cell supplies a current I_1 through a coil of resistance R_1, a current I_2 through a coil of resistance R_2. The emf of the cell is

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Concepts Covered - 1

Current Given by a Cell

 

  1.       Current supplied by the cell

 

  • Cell supplies a constant current in the circuit.

i=\frac{E}{R+r}    ,

 R- External resistance

r-  internal resistance

  • Potential drop inside the cell=ir

  • The internal resistance of the cell

r=(\frac{E}{V}-1)R

  • Power dissipated in external resistance

P=\left(\frac{E}{R+r}\right)^{2} R

  • Maximum power is obtained when the resistance value of the load is equal in value to that of the voltage sources internal resistance. 

Maximum power P_{max}=\frac{E^{2}}{4r}

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Current Given by a Cell

Study other Related Concepts

Current Given By A Cell Current Topic

Electric Current
Current Density
Drift Velocity
Ohms Law
Mobility Of Electron
Resistance And Resistivity
Change Of Resistance In Wires By Stretching
Resistor Colour Code
Heat And Power Developed In A Resistor
Resistors In Series And Parallel Combinations

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