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About this item
Demonstrate a DC generator, move the brushes to the commutator part, the external circuit does not rotate the rotor, the current meter pointer deflects in one direction, indicating that the output is DC.
When the armature coil rotates in a permanent magnetic field, the direction of the coil's cutting line changes periodically, and the direction and magnitude of the induced electromotive force also change periodically, that is, alternating current is generated.
AC power is supplied to the outside through the collector ring and brushes of the commutator. If the brushes are moved to the middle of the slip ring, where the copper half-ring is rectified, the output is DC.
To demonstrate the alternator, first move the brushes to the entire ring part of the current collecting ring, and then use a sliding rheostat and a DC current meter to form an external circuit.
Connect the output end of the generator to slowly rotate the rotor of the generator, the ammeter will clearly show the direction of current change, or you can use a DC voltmeter to connect to the output end for demonstration.
Product description
Maintenance and Storage
1. When using an ammeter as an indicating meter for demonstration, be sure to put a rheostat in series in the circuit to avoid burning Bad electric meter.
2. The contact part of the brush and the collector ring should be clean and in good contact.
3. When the generator is not in use, remove the belt and store it in a dry, ventilated place away from corrosive objects.
User's guidance
After receiving the goods, the installation is complete, shake the handle, the light bulb does not light up?
To this end, we have to check two places, one is whether the bulb is broken, the other is the key point we want to explain, the magnet coil is rotating and the rotor electrode piece is not in firm contact.
AC and DC generators are the process of converting mechanical energy into electrical energy. When the electrode pads are not in good contact, the converted electrical energy cannot be reflected, that is, the small light bulb does not light up.
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