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Bear in mind that like
charges repel and
unlikes attract.
When a battery is
connected as shown, the
negative terminal pushes
negative electrons
towards the junction.
The positive terminal
pushes holes towards the
junction.
If the voltage is high
enough then the barrier
will be overcome and
current will flow
through the junction.
There is a voltage
across the diode. 0.6
for silicon, o.3 for
germanium.
The junction is said to
be FORWARD BIASED.
The P type is the anode
of the diode, the N type
the cathode, as shown by
the diode symbol.
The resistor limits the
current to a safe level.
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