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| Illustration of the project. |
This is an experiment in which a bulb connected to an induction coil is lit without contact.
Intention
This project proves that current is generated by electromagnetic induction. When two coils are placed side by side, the electricity generated in one coil induces a voltage in the other without any wire connection. This is called induced voltage.
Concept
One coil should be connected to the bulb, and the other to the AC current. When the coil connected to the bulb is placed near the coils connected to the AC current, the electricity generated in the coil connected to the AC current will be induced in the coil connected to the bulb nearby, causing the bulb to start to glow.
Required materials
Copper wire 30 gauge
Two wooden spools
16-volt light bulb
A bulb holder
Procedure
Take a wooden spool and wind about 1200 turns of coated 30
gauge copper wire into a coil.
Take another wooden spool and wind about 50 turns into a
coil.
Connect a 16-volt bulb to the two unconnected ends of this
coil through a bulb holder.
Place the two coils close to each other. Adjust the distance
between the two coils so that there is about 2 cm between them.
Now connect the two unconnected ends of the first coil to the
AC power supply.
When AC current flows in the first coil, electromagnetic
induction occurs in the second coil. As a result, the bulb connected to the
second coil, which has no connection, will light on. If the second coil with
the bulb is brought a little closer to the first coil, it will glow more
brightly. The bulb lights up due to mutual induction.