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Electricity and Circuits

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NCERT Solutions for Class 6 Science Chapter 9

This chapter delves into the fundamentals of electricity and circuits, laying the groundwork for understanding electrical phenomena in daily life. 

1. Electricity:

The chapter introduces the concept of electricity as a form of energy that can be used to power various devices.

It might briefly touch upon the source of electricity, such as generators and batteries, but detailed exploration might be reserved for later grades.

2. Electric current:

The chapter explains that electricity flows in a continuous stream, similar to water flowing in a pipe. This flow of electricity is called electric current.

The unit of electric current is the ampere (A).

3. Electric circuit:

A closed loop through which electricity flows is called an electric circuit.

The chapter introduces the essential components of a simple circuit:

Battery: Provides the energy to drive the current flow.

Connecting wires: Allow the current to flow from the battery to other components.

Appliance: Converts electrical energy into another form of energy, such as light in a bulb or heat in a toaster.

4. Importance of a closed circuit:

For electricity to flow, the circuit must be closed. If the circuit is broken (e.g., by turning off the switch), the current cannot flow, and the appliance will not function.

5. Conductors and insulators:

Conductors are materials that facilitate the flow of electricity, such as metals like copper and aluminum. Insulators, on the other hand, are materials that impede the flow of electricity, like rubber, plastic, and wood.

6. Safety:

The chapter might emphasize the importance of electrical safety practices, such as avoiding contact with exposed wires and using appliances according to their intended purpose.

Additional points:

The chapter might use diagrams and illustrations to explain the components of a circuit and the flow of electricity.

The understanding of circuits is often built upon through practical activities and demonstrations.

NCERT Solutions for Class 6 Science Chapter 9

Exercises

1 . Fill in the blanks:

(a) A device that is used to break an electric circuit is called_____

(b) An electric cell has_______terminals.

Ans : (a) switch.

(b) two 

2. Mark ‘True’ or ‘False’ for following statements:

(a) Electric current can flow through metals.

(b) Instead of metal wires, a jute string can be used to make a circuit.

(c) Electric current can pass through a sheet of thermo Col.

Ans  : (a) True

(b) False

(c) False

3.Explain why the bulb would not glow in the arrangement shown in Fig. 9.13.

Ans :  The circuit is not complete.

4. What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

Ans : The primary purpose of an electric switch is to control the flow of electric current in a circuit. 

Here are some common electrical gadgets that have built-in switches:

  • Lights: Lamps, ceiling lights, and other lighting fixtures use switches to control their on/off state.
  • Fans: Table fans, ceiling fans, and exhaust fans often have built-in switches for speed control and turning them on/off.
  • Appliances: Most appliances like televisions, refrigerators, toasters, and blenders have built-in power buttons or switches to activate or deactivate them.
  • Electronic devices: Computers, mobile phones, and other electronic devices typically have power buttons or switches to turn them on/off and enter standby mode.

5. Using the “conduction tester” on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.

Ans : If the bulb in a conduction tester glows when you touch it to an object, then the object is a conductor. Here’s why:

Conduction tester principle:

  • A conduction tester is a simple circuit with a battery, a bulb, and two probes.
  • When the probes touch a conductor, the electricity from the battery can flow through the object and complete the circuit.
  • This completed circuit allows current to flow, lighting up the bulb.

Interpretation of the bulb glowing:

  • Since the bulb glows when the tester touches the object, it indicates that the object allows the current to pass through it.
  • This ability to conduct electricity is a key characteristic of conductors.

Therefore, a glowing bulb in a conduction tester test signifies that the object is a conductor, allowing electricity to flow through it.

6. Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.

Ans: Electricians wear rubber gloves while repairing electrical switches for two main reasons: safety from electrical shock and prevention of accidental damage. 

Safety from electrical shock:

  • Our bodies are good conductors of electricity. If an electrician’s bare hand comes into contact with a live wire while repairing a switch, electricity can flow through their body, causing a potentially dangerous or even fatal electrical shock.

Prevention of accidental damage:

  • Electrical components can be delicate, and even small amounts of moisture or oil from our skin can damage them.

7. The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

Ans : The handles of electricians’ tools like screwdrivers and pliers are covered with plastic or rubber for two main reasons:

1. Safety from Electrical Shock:

  • Electrical conductors: Metal tools like screwdrivers and pliers can conduct electricity. If an electrician uses a bare metal tool and accidentally touches a live wire while working on a switch or circuit, the electricity can flow through the tool and their body, causing a potentially serious or fatal electrical shock.
  • Insulating layer: Plastic and rubber are insulators. These materials resist the flow of electricity. When the tool handles are covered in these materials, they act as a barrier that prevents electricity from passing through the tool and into the electrician’s hand if they come into contact with a live wire.

2. Improved Grip and Control:

  • Grip and control: Plastic and rubber offer better grip compared to bare metal handles. This improved grip is crucial for electricians to handle tools precisely and safely, especially when working in tight spaces or awkward positions.
  • Reduced hand fatigue: The rubbery texture of the handle can also help to reduce hand fatigue during extended work periods. This allows electricians to maintain a firmer grip and better control over their tools, leading to safer and more efficient work.

NCERT Solutions for Class 6 Science Chapter 9

FAQ’s

What topics are covered in Class 6 Science Chapter 9?

This chapter covers fundamental concepts related to electricity and circuits, including the basics of electrical circuits, conductors and insulators, electric switches, and safety measures.

How can NCERT Solutions help me understand electricity and circuits better?

NCERT Solutions provide detailed explanations, examples, and illustrations to help you grasp complex concepts related to electricity and circuits. Additionally, the exercises provided in the solutions enable you to practice and reinforce your understanding.

Are there any practical applications discussed in this chapter?

Yes, Class 6 Science Chapter 9 discusses various practical applications of electricity and circuits, such as the use of electric switches in daily life, the importance of safety measures while handling electrical appliances, and the role of conductors and insulators.

How can I use NCERT Solutions to prepare for exams?

NCERT Solutions offer step-by-step solutions to all the questions provided in the textbook, making it easier for you to revise and practice before exams. By regularly solving the exercises and referring to the solutions, you can strengthen your conceptual understanding and improve your exam performance.

Where can I find NCERT Solutions for Class 6 Science Chapter 9?

You can find comprehensive NCERT Solutions for Class 6 Science Chapter 9 – Electricity and Circuits on reliable educational platforms like Education85. These solutions are designed to assist students in understanding the concepts effectively and scoring well in their examinations.

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