In this project, we will build a simple electric circuit that utilizes water as a switch to control a DC motor. When water is introduced between two conductive plates, the motor will turn on, and when the water is removed, the motor will turn off.
This experiment not only provides a hands-on understanding of electric circuits and conductivity but also opens up possibilities for creative applications and further exploration in the field of electronics.
Creating a simple electric circuit with a switch mechanism using water and a syringe to control the on/off state of a DC motor can be an engaging project.
Below are the materials you’ll need and step-by-step instructions for building the model:
Materials required:
- DC Motor
- Battery (suitable for the motor, e.g., 9V)
- Syringe
- Two conductive plates (metal pieces, such as aluminum foil or copper strips)/ safety pins
- Water
- Wires
- Small container or tray
- Electrical tape
- Alligator clips (optional)
Step by Step Video Instructions:
Step 1: Set up the Circuit
- Connect the Motor: Connect one terminal of the DC motor to the positive terminal of the battery using a wire.
- Prepare the Conductive Plates: Place two conductive plates in the small container or tray. These will act as the switch contacts. Ensure they are positioned close enough that water can bridge the gap between them but not touching each other when dry.
- Connect the Conductive Plates: Connect the free terminal of the DC motor to one of the conductive plates using a wire. Connect the other conductive plate to the negative terminal of the battery using another wire. You can use alligator clips for secure connections if available.
Step 2: Assemble the Water Switch
- Prepare the Syringe: Fill the syringe with water. The syringe will be used to pour water between the conductive plates to close the circuit.
- Position the Syringe: Hold the syringe above the conductive plates.
Step 3: Operating the Circuit
- Turn On the Motor: Slowly pour water from the syringe onto the conductive plates. The water will bridge the gap between the plates, completing the circuit and allowing current to flow, thereby turning on the motor.
- Turn Off the Motor: To turn off the motor, remove the water from the plates by either tilting the tray to drain the water or using an absorbent material to soak it up. Once the water is removed, the circuit will open, and the motor will turn off.
This model demonstrates a basic principle of electric circuits and how a simple switch can be created using water as a conductive medium.