CBSE Class 12 Physics 14 || Semiconductor Electronics Part -2
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Course
12 class
Institution
12 Class
Semiconductors are the materials which have a conductivity between conductors (generally metals) and non-conductors or insulators(such as ceramics). Semiconductors can be compounds such as gallium arsenide or pure elements, such as germanium or silicon. Physics explains the theories, properties and...
CBSE Class 12 Physics 14 || Semiconductor Electronics
Part -2
current through a PN junction diode changes very little with an increase in
applied voltage and it remains almost constant. the value of this current is
called the reverse saturation current music. The current through a reverse
biased diode suddenly increases for a specific value of applied voltage. this
phenomenon is called breakdown of the diode diode. Zener diodes are
available with output voltages ranging from a few volts to hundreds of volts in
order to provide good voltage regulation. It is essential that the current
through the zener diode is several times higher than the load current. This is
done by selecting a suitable series resistance R that ensures zener current in
the circuit is several times more than load current.. A lightemitting diode or an
led is a device that produces photons of different frequencies of light. Nnat is
especially fabricated heavily doped PN junction diode and cast. In a
transparent cover which allows the emitted light to shine through an led.. The
energy of the emitted photons and the color of the light produced depends
on the nature and the bandgap of the semiconductor material used in the led..
A large surface area of the PN junction in a solar cell generates measurable
photo current, making it a source of electricity.. The maximum intensity
radiation is produced by photons having energy equivalent to 1 point 5
electron volts.. semiconductors having bandgaps lower than 1. 5 electron volts
are not preferred in the making of the solar cells. the grid contact negative
and gives rise to a current. When a load is connected between the two. the
thin lightly doped region in a PNP or in an NpN transistor that separates the
emitter and collector is called the base. Connecting terminals are provided for
the emeter The collector and the base does a transistor is a three-terminal
device Suitable potential difference must be applied across both the PN
junctions to operate a transistor. This process is called biasing the transistor to
bias the to PN junction in the transistor.. NPN silicon transistors are the most
commonly used transistor and the common emitter configuration is the most
common circuit configuration.. A transistor is said to be in active state when
it's emitter. Base junction is forward biased and base collector junction is
reverse biased while biasing a transistor. The forward biased connection is
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