NCERT Solutions for Class 12 Help.html Physics Part I Chapter 3 Current Electricity

Current Electricity Here is the CBSE Help.html Chapter 3 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Help.html Current Electricity Chapter 3 NCERT Solutions for Class 12 Help.html Current Electricity Chapter 3 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 12 Help.html.

Question 1

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The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω , what is the maximum current that can be drawn from the battery?

Solution

Maximum current is drawn from a battery when the external resistance in the circuit is zero i.e., R = 0.

Given,
E.m.f of the battery,

ε = 12 V

Internal resistamce of the battery,

r = 0.4

Therefore, using the formula for maximum current drawn we get,

I_{\max} = \frac{ε}{r} = \frac{12}{0.4} = 30 A

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NCERT Solutions for Class 12 Help.html Physics Part I Chapter 3 Current Electricity

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω , what is the maximum current that can be drawn from the battery?

A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?
b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10^–4 °C^–1.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10^–7 m², and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature co-efficient of resistivity of silver.

A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

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Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

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NCERT Solutions for Class 12 Help.html Physics Part I Chapter 3 Current Electricity

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω , what is the maximum current that can be drawn from the battery?

A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10–4 °C–1.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10–7 m2, and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature co-efficient of resistivity of silver.

A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?
b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10^–4 °C^–1.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10^–7 m², and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?