Physics · JEE

Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel Concepts for JEE

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Concept explainer

Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel is a core JEE Main Physics subtopic under Current Electricity. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel in the JEE syllabus
Memorise key formulas and standard results linked to Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel
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JEE tips

Revise Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel with a one-page formula sheet before attempting mixed tests
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Common trap

Students often rush Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Current Electricity in JEE Main Physics.

Free sample questions

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Q1PhysicsUnit 12: Current Electricity

Fuse wire should be placed in the path of wire

Q2PhysicsUnit 12: Current Electricity

There are a large number of cells available, each marked

(6 V, 0.5 \Omega)

to be used to supply current to a device of resistance

0.75 \Omega,

requiring

24 A

current. How should the cells be arranged, so that power is transmitted to the load using minimum number of cells?

Q3PhysicsUnit 12: Current Electricity

A current of

I

ampere flows through a resistance

R

when connected across a cell of emf

E

and internal resistance

1 \Omega

When

R

is increased by

50 \%

, the current through the circuit is

0.8 A .

The value of

\boldsymbol{R}

is :

Q4PhysicsUnit 12: Current Electricity

In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire

x

cm long. If the length of the potentiometer wire is increased without changing the cell, the balancing length will (Driving source is not changed)

Q5PhysicsUnit 12: Current Electricity

If the switch at point

P

is opened (shown in the figure) choose the correct option

Q6PhysicsUnit 12: Current Electricity

A battery of emf

10 \mathrm{v}

and internal resistance of 0.5 ohms is connected across

A

variable resistance R.The maximum value of

\mathrm{R}

is given by:

Q7PhysicsUnit 12: Current Electricity

A galvanometer in a circuit:

Q8PhysicsUnit 12: Current Electricity

A battery has six cells in series and each cell has an electromagnetic force

1.5 V

and internal resistance

1 \Omega .

If an external load of resistance

24 \Omega

is connected to it. The potential drop across the load is

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Frequently asked questions

What concepts in Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel are essential for JEE?

Focus on core ideas across Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel. JEE tests application, not just memorisation.