How will you explain the activity of generation of electricity ?
Answers
Answer:
Electricity generation is the process of generating electric power from sources of primary energy. For utilities in the electric power industry, it is the stage prior to its delivery to end users (transmission, distribution, etc.) or its storage (using, for example, the pumped-storage method).
Explanation:
Game: Arrange the children in a circle.
Aim/Facts
The electricity carries the energy to where it is needed
This is very useful
Activity Discussion
Place the large bowl containing dry pasta at one side of the circle. The children walk round the circle and as they pass the bowl they pick up a piece of pasta then keep on moving. As they pass a pan, with a thin up-turned lid, they drop the pasta on the lid so a sound is made.
See Apparatus List
See safety note Explain that the circle represents an electrical circuit. The children represent the particles (electrons) and the pasta represents the energy which is collected by the particles from the power-point. The pan represents an electric bell. The energy is used to make the sound.
7. Circuits
Activity Discussion
Show the animated circuit in Slide 8. Point out that the electrons are all round the circuit before the switch is closed. When the switch is closed the battery is connected across a complete loop of conducting material. Then the electrons move round the circuit as the electricity flows.
This is explained in the presentation on Electricity.
8. Hold up a piece of wire 10 cm long and about 1mm thick.
Aim/Facts
Electrons are very, very, very tiny - far too small for us to be able to see them
Activity Discussion
Explain that there are a huge number of electrons in the piece of wire. There are one hundred billion, billion electrons in the wire.
Slide 9
Alternatively use the analogies in the Electricity presentation. Ask them for the biggest number they know.
There could be a guessing game where they are encouraged keep increasing by millions.
Point out that if the same number of small marbles were melted to make a huge marble – it would be bigger than the Earth.
Or if we measured the distance to the nearest star in millimetres we would get about same huge number!
9. Circuits: slide 10
Aim/Facts
If you want to do something useful – you need energy
Electricity brings energy to where you need it
Activity Discussion
Revise what they know from other activities.
Slide 11
Reinforce: by using electricity we can make things work just where we want. That the energy flows round wires and is clean – no mess in the house. Point out that the electrons are all round the circuit before the switch is closed. They move round the circuit as the current flows. Then when the switch is opened they are still all round the circuit.
You could use the game in the Electricity presentation.
10. Point out that we know why electricity is useful but need to know how it is made.
Aim/Facts
Batteries or generators make electricity
Activity Discussion
Slide 12
11. Lemon battery demonstration
Aim/Facts
A chemical reaction occurs which releases energy
The energy is stored in the battery
When a battery is connected in a circuit the electrons carry the energy to where it is needed
Activity Discussion
See Apparatus List
Have 4 lemon batteries prepared with a 2p coin and a zinc coated nail in each.
Connect a circuit with one lemon. Then try two lemons. Three lemons should light a red LED dimly. Four will light the LED brightly.
Slide 13 Explain that a battery needs to have an acid and two different metals dipped in it. The lemon juice is acidic, the coin is copper and the nail is covered with zinc. Other combinations work as well.
(Extra- each lemon is a cell. When cells are connected together they are called a battery.)