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QUESTION: 1

A car battery has ________ resistance than a dry cell.

Solution:

a car battery of 12V provides a current of about 200A, which is the current needed to operate a starter motor. So a battery has a very small internal resistance.

also,The cause of non-correctable battery problems and.A weak cell holds less capacity and is discharged more quickly.

QUESTION: 2

The internal resistance of a battery cannot be measured with a conventional multimeter

Solution:

QUESTION: 3

Electromotive force is a

Solution:

QUESTION: 4

emf is measured in

Solution:

QUESTION: 5

Under what condition, the current drawn from the cell is maximum?

Solution:

QUESTION: 6

Internal resistance of cell when there is current of 0.40 A when a battery of 6.0 V is connected to a resistor of 13.5 Ω is

Solution:

QUESTION: 7

Two terminals of a cell of emf 2.5 V are connected to the two ends of the 10 ohm resistance coil. If the current in the circuit is 0.2 A, then the internal resistance of the cell is

Solution:

The internal resistance of the cell can be obtained from the relation,

I=ε/R+r

0.2=2.5/(10+r)=2.5ohm

QUESTION: 8

Current provided by a battery is maximum when

Solution:

QUESTION: 9

What is the maximum current that can be drawn from a cell of emf E and internal resistance r connected to an external resistance R?

Solution:

as the maximum current that can be drawn from a cell is for R =0 therefore, it is I = E/r.

QUESTION: 10

The term open circuit means

Solution:

An open circuit implies that the two terminals are points that are externally disconnected, which is equivalent to a resistance R=∞ . This means that zero current can flow between the two terminals, regardless of any voltage difference.

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