EASY

12th CBSE

IMPORTANT

Earn 100

A cell of emf $ξ$ and internal resistance $r$ is connected across a variable resistance $R .$ Plot graphs showing the variation of terminal p.d. $V$ with $R .$ Predict from the second graph under which $V$ becomes equal to $ξ .$

Important Questions on Current Electricity

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 39

Two identical cells, each of emf

ε

and internal resistance

r

are connected in parallel to an external resistance

R .

Find the expression for the total current flowing in the circuit.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 40

Two cells of emf

ε_{1}

and

ε_{2}

and internal resistances

r_{1}

and

r_{2}

respectively are connected in parallel. Obtain expressions for the equivalent
(i) resistance. Write the corresponding formulae for the series combination.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 40

Two cells of emf

ε_{1}

and

ε_{2}

and internal resistances

r_{1}

and

r_{2}

respectively are connected in parallel. Obtain expressions for the equivalent emf of the combination.
Write the corresponding formulae for the series combination.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 41

Name any one material having a small value of temperature coefficient of resistance. Write one use of this material.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 42

Define the terms electric energy and electric power. Give their units.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 43

Obtain the formula for the 'power loss' in a conductor of resistance

R,

carrying a current

I .

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 44

Two heating elements of resistances

R_{1}

and

R_{2}

when operated at a constant supply of voltage,

V,

consume powers

P_{1}

and

P_{2}

respectively. Deduce the expressions for the power of their combination when they are, in turn, connected in series.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Text Based Exercises>Q 44

Two heating elements of resistances

R_{1}

and

R_{2}

when operated at a constant supply of voltage,

V,

consume powers

P_{1}

and

P_{2}

respectively. Deduce the expressions for the power of their combination when they are, in turn, connected in parallel across the same voltage supply.

A cell of emf ξ and internal resistance r is connected across a variable resistance R. Plot graphs showing the variation of terminal p.d. V with R. Predict from the second graph under which V becomes equal to ξ.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

A cell of emf $ξ$ and internal resistance $r$ is connected across a variable resistance $R .$ Plot graphs showing the variation of terminal p.d. $V$ with $R .$ Predict from the second graph under which $V$ becomes equal to $ξ .$