Sensors & Circuits
Beginner
30 mins
Teacher led
What you need:
Snap Circuits

LED Circuit and Phototransistor

In this lesson, you'll guide your students through building a circuit that responds to light, using a phototransistor and LED light block. They'll learn about the direction of electricity flow and the role of light in controlling electricity. The lesson concludes with an exploration session to reinforce the concepts learned.
Learning Goals Learning Outcomes Teacher Notes

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    1 - Introduction

    Today, we are going to learn about phototransistors and what they do. 

    Explain to your students that today we will be using the phototransistor block (Q4). A phototransistor is a special part that can see light. When it sees light, it turns things on in the circuit, like a light switch that works by seeing instead of by touching.

    Our goal today is to make a circuit that can see light and do something cool when it does!


    2 - Prepare the Base Grid

    Instruct your students to place the base grid on a flat, stable surface. Make sure each group has enough space to work comfortably. This is an important step to ensure the stability of the snap circuits they will build.



    3 - Inserting Batteries

    At this stage, we need to ensure that the batteries are in the battery holder. If they are not already there, please insert them now. Each Snap Circuits set you are using will need its own set of batteries. So, if you are using multiple sets, make sure each one has its batteries properly inserted in the battery holder. This is crucial for the functioning of the circuits we will be building.


    4 - Place the battery holder (B1)

    Now, let's place the battery holder on our base grid. Tell your students to find the spot marked as C4 on the grid, this is where we will place the battery holder (B1).

    Once they have placed the battery holder correctly, they should press it gently to snap it into place.



    5 - Place wire block (3)

    Now let's put in the number 3 wire. Instruct your students to find the number 3 wire block. They need to connect one end of the wire block to the point C2 on the grid and the other end to E2. Make sure the wire block snaps into place securely.



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