Science around: Light up the little light bulb

Teaching objectives

Scientific concepts:

1. The small light bulb will glow only when current flows through the filament.

2. Using electricity to light a small light bulb requires a complete circuit.

3. A complete circuit can be built in more than one way using the same materials.

4. If the two ends of the battery are directly connected together with wires, a short circuit will occur.

Process and method:

1. Connect simple circuits.

2. Observe, describe and record the experimental phenomenon of lighting the small light bulb.

3. Make bold imaginations and speculations about the flow of electric current based on experimental phenomena.

Emotions, attitudes and values:

1. Experience the pleasure of observing things around you day and night.

2. Dare to make bold imaginations and speculations based on phenomena.

3. Stimulate interest in further exploring electricity.

Teaching focuses on correctly connecting circuits

Teaching difficulties: understanding the structure of small light bulbs and correctly connecting small light bulbs

Teaching preparation

Small light bulbs, 1. 5 V dry cell, wire, experiment record sheet, cross-section of a small light bulb or a large cut-out large light bulb, pictures of batteries and small light bulbs, etc.

Teaching process

1. Introduction

When we turn on the switch in our home, the light will turn on. Why does the light turn on? Have you ever considered such a question? Let's study the little light bulb first!

2. Understand the structure of small light bulbs

1. The structure of small light bulbs

1) Everyone has seen small light bulbs, right? Can you draw a picture of the little light bulb in your mind? It is required to draw out the internal structure of the small light bulb and observe the small light bulb.

2) Each group has a light bulb and observe the structure of each part of the small light bulb.

3) Exchange the observation results and make corrections to the small light bulbs you drew.

4) Guess how the current passes from inside the small light bulb? Draw with your finger.

2. Observe the wires and batteries, and talk about the structures of the wires and batteries

3. Let the small light bulb shine

1. Light up the small light bulb

1) Group activities----Connect these experimental equipment, find a way to make the small light bulb light up, and use your hands to explain how the current flows? And keep records and use arrows to draw the direction of flow.

2) Organize student reports: The connected groups will present on stage and talk about how electricity flows? What is its direction? Even if the connections are not connected well, they will be presented on stage and analyze possible problems with the whole class - penetration short circuit, open circuit and other knowledge.

2. Try to use various methods to light the small light bulb

1) Draw a picture of other ways to light the small light bulb.

2) Draw the flow path of current in the circuit for each connection method, and talk about what you think.

3) Paste the connection diagram on the blackboard and communicate with the whole class

4) Analyze the common points of the connections

3. Show the physical diagram , analyze which light bulb will light up and which light bulb will not light up.

4. Safety Education

What we use in the classroom are batteries. The voltage is small and does not harm lives. However, the power generated by the power plant is sent to each house through wires. The electricity in each household is 220V alternating current, which is enough to cause electric shock accidents and death, so we cannot directly use the electricity in the sockets at home or school for experiments. Pay special attention during use.

Blackboard writing design:

Light up the small light bulb

Small light bulb? Wire? Battery