this project is based on the
principle of
electromagnetic introduction, this
phenomenon
was discovered by an English
scientist Michael Faraday in 1831 ,
according to this principle if a
conductor is placed in a variable magnetic field an EMF (electromotive force)
is produced across the ends of the conductor.
This is a very helpful theory and
have many real life applications wireless electricity transmission is one of
them.
Another example is Tesla tower,
also electric motors runs on this
principle.
for more information
visit:
COMPONENTS REQUIRED :
1. Enameled copper wire (appx 5 meter)
2. A 2n2222 (NPN) transistor
3. A resistor (1k-2k)
4. A battery(9v or 12v)
5. A battery connector
6. A LED
PROCEDURE
:
1.
coil 1(primary coil):
1. Lets first make our primary coil
for this take the enameled copper wire and make 15 or more turns with the help
of a cylindrical base(more the number of turns more will be the distance of
transmission).
2. Now make a loop.
3. Again make same number of turns
as before (for example, if the number of turns was 15, you have to make 15 more
turns) and cut it.
4. Now with the help of a
match stick or a lighter burn all the three ends of the coil(2-ends and one
loop) to remove the insulation.
2.
coil 2 (secondary coil):
5. Now we have to make the secondary
coil,
For this again take
some enameled copper wire and make same number of turns as it was made in
primary coil( for example, if the total number of turns were 30, you have to
make secondary coil of 30 turns)
6. Again as previous with the help
of a lighter or a blade remove the insulation of both the ends of the secondary
coil.
CONNECTIONS
1.
primary coil
1) Connect the negative terminal of
the battery connector to the emitter of the transistor.
2) Connect the positive terminal of
battery connector to the loop of the coil(the loop which was made after half of
the total numbers of the turn).
3) Connect one end of the
resistor to the base of the transistor and other to the end of the of
primary coil.
2.
secondary coil
Connect both ends of the LED
to the secondary coil.
WORKING
|
In this, in the primary coil the
transistor is generating high-frequency AC current across the primary coil
and this results in the generation a magnetic field around the primary
coil. As the coil is center tapped, the two sides of the coil start to charge
up. One side of the coil is connected to the resistor and another side is
connected to the collector terminal of NPN transistor. During the charging
condition, the base resistor starts to conduct which turns on the transistor.
The transistor then discharges the primary coil as the emitter is connected
with the ground. This charging and discharging of the primary coil produces a
very high frequency oscillation signal which is further transmitted as a
magnetic field. And in secondary coil that magnetic field is transferred into
the other coil, and by the Faraday’s law of induction, the receiver coil start
producing EMF voltage which makes the LED bulb to glow.
LIMITATIONS
1) very poor efficiency
2) wastage of power
3)cannot be used for very long
distance.
components
buying links:
1)
copper wire: www.amazon.in
2)2n2222 transistor: www.amazon.in
3.battery:
www.amazon.in
4)LED
: www.amazon.in
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