Unit - 8 Electricity

 Unit - 8

Electricity

summary

1. Electricity is a very useful power in daily life.

2. The main sources of electricity are cells, photo cells and generators.

3. Power sources, wires, devices, and switches connected so that current can flow continuously

A closed path is called an electric circuit.

4. A material in which current flows easily is called a good conductor of electricity.

5. A material that does not conduct electricity is called a non-conductor of electricity.

6. A substance through which electricity partially flows is called a semiconductor.

3. Write answers to the following questions:

  (a) What is photo cell?

  (b) What is hydropower? A brief article on the method of producing hydroelectric power.

  (c) Diagrams and various parts of a circuit of a wire, wire, lamp and switch.

Name article.

  (d) What is an electric circuit? What is its meaning, article.

  (e) Why is the copper wire covered with plastic?

  (f) What is called a non-conducting material? Two example articles.

Answer 👉 

(a) A photo cell is a device that converts light into electricity. It is made of a semiconductor material, such as silicon, that has been doped with impurities. When light hits the photo cell, it knocks electrons loose from the semiconductor material. These electrons flow through the material, creating an electric current. Photo cells are used in a variety of applications, including light meters, solar cells, and burglar alarms.

(b) Hydropower is a form of energy that is generated by the force of moving water. It is the most widely used renewable energy source in the world, accounting for about 16% of global electricity generation. Hydropower plants work by using the force of moving water to turn a turbine, which generates electricity. The most common type of hydropower plant is a dam, which creates a reservoir of water that can be used to generate electricity. Other types of hydropower plants include run-of-the-river plants, which do not use dams, and tidal power plants, which use the tides to generate electricity.

(c) A circuit is a complete path that electricity can flow through. It consists of a power source, a load, and a conductor. The power source provides the energy that flows through the circuit. The load is the device that uses the energy, such as a light bulb or a motor. The conductor is the material that allows the electricity to flow, such as a wire.

The power source is the battery, the load is the light bulb, and the conductor is the wire. When the switch is closed, electricity flows from the battery through the wire to the light bulb. The light bulb then converts the electrical energy into light energy.

(d) An electric circuit is a path that electricity can flow through. It consists of a power source, a load, and a conductor. The power source provides the energy that flows through the circuit. The load is the device that uses the energy, such as a light bulb or a motor. The conductor is the material that allows the electricity to flow, such as a wire.

A circuit can be either open or closed. An open circuit is a circuit that does not have a complete path for electricity to flow. A closed circuit is a circuit that has a complete path for electricity to flow.

(e) Copper wire is covered with plastic to protect it from corrosion. Corrosion is the process of metals being eaten away by chemicals in the environment. Plastic is a non-conductive material, which means that it does not allow electricity to flow through it. This prevents the electricity from flowing through the copper wire, which would cause the wire to heat up and eventually break.

(f) A non-conducting material is a material that does not allow electricity to flow through it. Some examples of non-conducting materials are plastic, wood, and rubber. Non-conducting materials are used to insulate electrical wires and other electrical components. This prevents the electricity from flowing through the material, which could cause a fire or other hazard.