Electric bell
Demonstration electric bell with a transparent base plate: four experiments on its construction, electromagnet and self-interrupting contact.
The DC electric bell model is assembled on a base with terminals and a power button; the transparent base plate keeps the mechanism visible. The design includes an electromagnet, an armature plate with a striker, a metal bell and an adjusting contact needle. Four demonstrations are carried out on the model: the structure and principle of operation of the bell, the magnetization of the coil by current and the attraction of the armature, the operation of a self-interrupting contact with periodic blows on the bell, and in combination with a vacuum pump, the attenuation of sound when pumping out air. The device is used in the study of electromagnetism and sound in physics lessons.
- 1.Base with terminals and power button - 1 pc.
- 2.Support plate (transparent) - 1 pc.
- 3.Electromagnet - 1 pc.
- 4.Armature plate with striker on a vibrating plate - 1 pc.
- 5.Metal bell - 1 pc.
- 6.Adjusting contact needle - 1 pc.
- Design and principle of operation of a DC electric bell
- Electromagnet: magnetization of the coil by current and attraction of the armature
- Self-interrupting contact: automatic opening and closing of the circuit and periodic striking of the bell
- Sound propagation in air (in combination with a vacuum pump): attenuation of the bell sound as air is pumped out
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