Item Type: Electrical Bell Science Experiments_x000D_ Material: Pvc_x000D_ Use:_x000D_ For compulsory education curriculum standard experimental materials for middle school physical science teaching._x000D_ Structure:_x000D_ Made of plastic and consists of electromagnet, armature, iron bell, liner and base._x000D_ Maintenance:_x000D_ 1, The instrument coil is wound with high strength enamelled wire, pay attention to protect insulation when using, to avoid short circuit between turns affecting the test results._x000D_ 2, The instrument is made of plastic, do not approach organic solvents, do not wipe with hard objects, so as not to scratch the surface of the product._x000D_ 3, After use, please put in a cool and dry place, do not store in a humid acid and alkali environment, so as to avoid rust and corrosion of the product. 1Teaching Tools: The kit is very suitable for teachers to explain the physics knowledge related to magnetic effect of current. Need to connect the bell to DC 3?6V power supply. 2Vertical: With a base, so that this experimental demonstration is more intuitive, and is easier for students to observe state of all compents and learning. 3Principle: When the electromagnet is energized, it is magnetic, absorbs the armature, makes the dynamic and static contacts contact, and uses the magnetic effect of current to work. 4When Powered on: Electromagnet can attracts the reed. When the reed moves to the magnet, the hammer strikes the iron bell to make a sound. moMoving plate and the static plate contact, and the current directly passes through the circuit to form a loop. 5Eternal Ringing: When the electromagnet is powered off, the reed automatically springs back to its original place, the current re passes through the electromagnet, attracts the reed again, the iron bell continues to ring, and the electric bell is constantly rung.1 x Electric Bell 2 x Connecting Cable