मराठी

Name two factors on which the internal resistance of a cell depends and state how does it depend on the factors stated by you.

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प्रश्न

Name two factors on which the internal resistance of a cell depends and state how does it depend on the factors stated by you.

State the factors on which the internal resistance of a cell depends.

थोडक्यात उत्तर
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उत्तर

Internal resistance of a cell depends upon the following factors:

  1. The surface area of the electrodes: Larger the surface area of the electrodes, less is the internal resistance.
  2. The distance between the electrodes: As the distance between the electrodes increases, the internal resistance of cell also increases. It is also affected by the nature, concentration and temperature of the solution (electrolyte).
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पाठ 8: Current Electricity - EXERCISE - 8(B) [पृष्ठ २००]

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सेलिना Physics [English] Class 10 ICSE
पाठ 8 Current Electricity
EXERCISE - 8(B) | Q 3. | पृष्ठ २००

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What happens to the resistivity of semiconductor with the increase of temperature?


A cell of Emf 2 V and internal resistance 1.2 Ω is connected with an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in the diagram below:

1) What would be the reading on the Ammeter?

2) What is the potential difference across the terminals of the cell?


Explain why the p.d across the terminals of a cell is more in an open circuit and reduced in a closed circuit. 


The diagram below in Fig. 8.40 shows a cell of e.m.f. ε = 2 volt and internal resistance r = 1 ohm to an external resistance R = 4 ohm. The ammeter A measures the current in the circuit and the
voltmeter V measures the terminal voltage across the cell. What will be the readings of the ammeter and voltmeter when (i) the key K is open, (ii) the key K is closed. 

  


A battery of e.m.f 3.0 V supplies current through a circuit in which the resistance can be changed.
A high resistance voltmeter is connected across the battery. When the current is 1.5 A, the voltmeter reads 2.7 V. Find the internal resistance of the battery. 


A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistances 3 ohm and 6 ohm is series Find:
(a) the current through the battery
(b) the p.d. between the terminals of the battery. 


A cell of e.m.f. ε and internal resistance 𝔯 sends current 1.0 A when it is connected to an external resistance 1.9 Ω. But it sends current 0.5 A when it is connected to an external resistance 3.9 Ω. Calculate the values of ε and 𝔯.


When a resistance of 3Ω is connected across a cell, the current flowing is 0.5 A. On changing the resistance to 7Ω, the current becomes 0.25A. Calculate the e.m.f. and the internal resistance of the cell.


Study the diagram:

  1. Calculate the total resistance of the circuit.
  2. Calculate the current drawn from the cell.
  3. State whether the current through 10 Ω resistor is greater than, less than or equal to the current through the 12 Ω resistor.

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