lesson plans of block teaching

• Electricity and circuits
• Combustion and flame
• Fun with magnets

Electricity and circuits

(Lab lesson)

Instructional Objectives:

-Students will be able to recall terms like electric cell, terminal, filament.

- Students will be able to recognize the positive and negative terminal of the cell.

-Students will be able to detect errors in connection if not done correctly.

- Students will be able to develop skills in making their own circuit.

Concepts:

-The electric cell has positive and negative terminal.

-the thin wire that gives off light in the bulb is the filament.

-In an electric cell, the direction of current is taken to be from positive to negative terminal of the cell.

Previous  Knowledge:

-Students have knowledge about batteries and bulbs.

Instructional Materials:

Electric circuit---wires, bulb, electric cell, worksheets, C.B., chart.

Activity -1

Students were given instructions what to do. They were given materials for different electrical connections. They were told to do the connection as shown in the worksheet and fill in the observation table.

Tr discusses the worksheet with the students and asks reasons as to why the bulb does not glow in some cases. The bulb glows only when the circuit is complete. The circuit is a closed path through which electric current flows.

Tr. Draws the circuit and explains the different parts. The electric cell has 2 terminals- positive and negative. The bulb also has two terminals and the bulb will glow only when the terminals of the electric cell are connected to the terminals of the cell.

Evaluation

Combustion and flame

Instructional Objectives:

- The student will be able to define the term combustion

-Students will be able to explain various conditions for combustion to take place.

-The student will be able to differentiate between combustible and non-combustible substances.

-The student will be able to give examples of combustible and non-combustible substances.

Concepts:

- Combustion is the process of burning of a substance in the presence of air to give off heat and light.

-Combustible and non-combustible substances.

-Conditions required for combustion: fuel, air(oxygen), attainment of ignition temperature.

Previous  Knowledge:

-Have knowledge about different fuels and combustion.

Instructional Materials:

Cloth, wood, cotton, candle charcoal, paper, iron nail, worksheets, C.B.

Set Induction:

Tr. Discusses about fuels by showing the students 2 kerosene lamps- one with kerosene and one without kerosene and asks questions about the fuel and why the lamp without kerosene does not burn.

Statement of the topic:

So in today’s class we shall study more about combustion in the topic “Combustion and flame”.

Development of the topic:

Activity-1

Fill in the worksheet. Put a tick mark at appropriate places.

MATERIAL	PRODUCES		IS FUEL PRESENT?
	HEAT	LIGHT	YES	NO

A chemical process in which a substance reacts with air to give off heat and light is called combustion.

Substances that burn or undergo combustion are combustible substances.

Substances that do not undergo combustion are non-combustible.

Activity-2

Tr. Conducts experiment with candle and glass. Covers the burning candle with glass. Hence we can say that combustion takes place in the presence of air (oxygen).

Activity-3

Put a tick mark at appropriate places.

SUBSTANCE	BURNS QUICKLY	TAKES TIME TO BURN
Paper, wet paper
dry Cotton, wet cotton
Dry leaf, green leaf
Dry Cloth, wet cloth
Copper wire

For combustion to take place attainment of ignition temperature is required.

Ignition temperature is the minimum temperature at which a substance burns.

It depends upon 2 factors- humidity and thickness of the material.

Closure:

So in today’s class we have studied about combustion and the different conditions required for combustion to take place.

Evaluation:

What is combustion?

What are combustible substances? Give examples.

What are non-combustible substances? Give examples.

Which are the conditions required for combustion to take place?

Homework:

Differentiate between combustible and non-combustible substances with examples.

Fun with magnets

Instructional Objectives:

-Students will be able to recognize the different magnets based on its shape.

- Students will be able to differentiate between magnetic and non-magnetic materials.

-Students will be able to give examples of magnetic and non-magnetic materials.

 Concepts:

-magnetite is a natural magnet.

-the materials which get attracted towards a magnetic are magnetic.

Materials which are not attracted towards a magnetic are non-magnetic.

Previous  Knowledge:

-Students have knowledge about magnets.

Instructional Materials:

 Magnets, iron fillings, pin, iron nail, ruler pencil, paper pin, wood, worksheets, C.B.

Set Induction:

Few days before delivering the lesson the teacher performs the experiment on magnetic levitation in the class and does not explain any thing.

The day of the lesson the students come with questions and some said that it was because of the poles of the magnet. The like poles repel each other.

Statement of the topic:

So in today’s class we shall we shall study more about magnets in the topic “Fun with magnets”

Development of the topic:

Magnets are objects that produce an area of magnetic field. Because of this it gets attracted to materials like iron, nickel, cobalt.

The teacher tells the students about the discovery of the magnet and tells a boy to act out the scene. (tr. Had first only prepared the student to act out and told him what he had to do). Tr. Tells about natural magnets and how it was discovered from the rock.

Tr. Gives magnets to the students and asks them to name the poles of a magnet. The magnet has two poles – North Pole and the South Pole. The magnets are of different shapes like the bar magnet, horse shoe magnet, cylindrical magnet, etc. but all have the North Pole and the South Pole.

Unlike poles of a magnet attract each other and like poles repel.

Activity

Tick the correct option from the table.

MATERIAL	GET ATTRACTED TOWARDS A MAGNET	DO NOT GET ATTRACTED TOWARDS A MAGNET
Iron nail
Plastic
Coin
Rubber
Copper
Paper pin
wood

The materials which get attracted towards a magnet are magnetic. Example- iron nail, nickel, cobalt.

The materials which do not get attracted towards a magnet are non-magnetic. Example-paper, plastic, rubber.

So in todays class we have studied about magnets, the different types of magnets and the magnetic and non-magnetic materials.

Evaluation

Fill in the gaps by writing the names of different magnets.

Column 1 shows different positions in which one pole of magnet is placed near that of an other. Column 2 indicates the resulting action between them. Fill in the blanks.

Column 1	Column 2
N-N
S-N	ATTRACTION
N-S
_ -S	REPULSION

 Tr discusses worksheet with the students.

Homework

Is sharpener magnetic or non- magnetic? Give reason.