This is a working model of an electric bell. When the switch is turned ON, electric current flows through the circuit, powering the DC motor.
The motor rotates the nut attached to its shaft, which hits the steel glass to produce a sound. This demonstrates the basic idea of how electric bells use mechanical action to generate sound.
Materials Needed:
- Steel glass (to act as the bell)
- Small DC motor (3V or 9V)
- Metal nut (to strike the bell)
- Wire (for connections)
- Switch (to turn the bell on and off)
- 9V battery (or appropriate power supply for the motor)
- Rubber band / straw / stick (to hold the striker)
- Cardboard base (to support everything)
- Tape / glue / hot glue gun
Steps to Build the Model:
- Prepare the Base:
- Take a piece of cardboard and fix the steel glass vertically or upside-down with hot glue.
- Attach the Nut to the Motor Shaft:
- Tie or glue the nut securely to the shaft of the DC motor. When the motor rotates, the nut will act as the striker.
- Mount the Motor:
- Fix the DC motor on the cardboard near the steel glass using tape or glue.
- Ensure the nut can hit the steel glass when the motor rotates.
- Connect the Circuit:
- Connect one wire from the motor to the battery.
- Connect the other motor wire to one terminal of the switch.
- Connect the other terminal of the switch back to the battery.
- This forms a simple switch-controlled circuit.
- Test It Out:
- Flip the switch ON. The motor should rotate, causing the nut to spin and hit the steel glass repeatedly, creating a bell sound.