Lesson Plan of Generating Electricity
General Science Grade VIII
Students’ Learning Outcomes
· Design an experiment to generate electricity.
· Explain the working of the model generator.
Information for Teachers
· Electricity generation is the process of generating electrical energy from other forms of energy.
· We need electricity in our daily life.
· We don’t find electricity just lying around ready for us to use. We have to generate it.
· Dynamo converts the mechanical; energy into electrical energy.
· Electrify is generated by using the energy from different sources i.e. fuels, coal, wind, hydro-electricity, solar, nuclear, Thermal power, tidal power,
· Hydro-electric power stations generate electricity using water trapped behind the dams.
Concept Map
Material / Resources
Dynamo, connecting wire, bulb, switch, hand pulley, wooden board, string, and bicycle fitted with dynamo
Worm up activity
· Show the picture of a dam to the students and ask them:
Ø What is happening in the picture?
Ø What is the function of turbine?
· Show the picture of a power station and ask the following questions:
Ø Where does the electrical energy come to our houses?
(Expected response: From power station)
Ø We use generators at our homes. What is its function?
(Expected response: Produce Electricity)
Ø What is dynamo?
(Expected response: Dynamo converts mechanical energy into electrical energy)
Development
Activity 1
· Set the following apparatus according to the following diagram.
(Dynamo, connecting wire, bulb, switch, hand pulley, wooden board, string)
· Demonstrate the working of this model electricity generator.
· Ask different students to rotate the pulley and observe its effect on the bulb.
· When pulley will be rotated, string attached to it will rotate the dynamo.3this in turn will make the bulb glowing.
· Faster the pulley is rotated; more light will be produced by the bulb.
· This experiment shows that potential energy provided by the hand is used to rotate pulley and dynamo converts this energy into electrical energy
Activity 2
· Bring a bicycle fitted with dynamo in the class.
· Ask a student to move the paddle of bicycle in order to move the wheel. As the dynamo is connected with the tire so it will also rotate.
· The bulb connected with the dynamo will provide light.
· Faster the wheel of the bicycle is moved; brighter will be the light of the bulb.
· This indicates that the potential energy stored in human body is used to move the wheel, which turns the dynamo and electricity is produced.
Sum up / Conclusion
· Show the picture of a dam or hydro-electrical power station to the students and conclude the lesson by telling the students that model generator generate electricity by using other forms of energy.
A schematic view of a hydro-power plant
Assessment
· As the following questions to assess the students:
Q1. How can we produce electricity on a large scale?
(Expected response: By using the energy from other sources).
Q2. Name the different energy sources we need to generate electricity.
(Expected response: Fuels, hydro-electricity, wind etc
Q3. In a generator, what is the function of dynamo?
(Expected response: To convert mechanical energy into electrical energy).
Follow up
· To produce electrical energy, generators are being used at houses, hospitals, offices etc. as alternate to national supply of electricity.
· Renewable sources as solar energy and wind energy are also being used to produce electrical energy at cheaper rates.
· General awareness to conserve the electrical energy should be created in students in order to overcome the electrical energy crises in our country.
· Lights and electrical appliances should be switched off when not in use.
