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Title: Electronics And Modern Technology
Description: This is a Chapter in Physics about Modern technology

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7
...

1
...

Unit:- Ohm
2
...

Unit:- Henry(H)
Practical unit milli henry(mH)
Advantage:• there is no loss of energy

Limitation:-

3
...

Unit:- farad(F)
Other units are micro farad, nano farad,
pico farad
Capacitors in which paper is used in between the
plates is paper capacitors
...

Germanium and silicon are main semiconductors
...
[First electronic computer]
Diode, Transister and IC Chip are made use
semiconductor
...


Diode

To convert AC to DC
...

Here the diode’s positive is connected
with cells positive
...

• Reverse Biasing:- The current does’nt
flow if p region is connected to
negative terminal of the cell and n
region connected to positive terminal
...
So the current does not
flow through the circuit
...
LED(Light Emitting Diode)
Some diode emitt light,they are LED
...

Advantage:•






Low enegy consumption
Small in size
Long lasting
Low cost
Light of various colours
Unaffected by temperature variation








Head lamps of vehicles
Trial lamp
Light show
Traffic signals
Display boards
Street light

Uses:-

Rectification
It is the process of converting AC to DC using
diode’s
...
Half wave rectification
Using one diode we get half wave of DC output
...
Full wave rectification
Using two diode's we get full waves of DC output
...


Transister

Increase the strength of electrical signals
...
Amplification
Amplification Amplificais the process of
strengthening electric current
...


IC Chip(Integrated circuit)

It is an arrangement incoporating the functions of
a lot of transistors, diodes, resistors, capacitors,
etc
...

Importance:• Ability to minimize the size of
electronic electrondevices since the
function of crores of transistors and
other components are incoporated in a
chip
...
Telecommunications
• Internet
• Television
• Mobile phone
• Radio
2
...

• They are the particles of light
• Laser optics, fibre optics,etc
...
Wifi(Wireless Fidelity)
• This is the method in which data is
transferred using radio waves link
without connecting with wires
...

• Using single WiFi modem,more
computers can be linked to Internet
without wire connection
...

4
...
This is done by image
sensor in camera
...

• No of pixels that decides the clarity of
the pictures(2mp, 5mp)
...

5
...

• HD transmission depending on the
maximum no of pixels in each frame
...

6
...

7

• 1nm=10-9m
• One nanometer is the length can be
obtained when 3 atoms led side by
side
...

• For example opaque object will change
into transparant object(Copper), Non
inflammable substances undergo
combustion(aluminium), Substances
without soluble can become
soluble(gold)
...

Highly efficient batteties
...
,
Display screens which are lighter
...

Long lasting tennis ball
...
Robotics
• Robotics are machines that perform
their tasks by themselves or by remote
control
...

Different fields using robots:a
...
Mobile robots
• Move on tracks or move using legs ore
wheels
c
...
Domestic robots
• Modern domestic chores
• Modern toys
e
...
In the field of defence

9

10


Title: Electronics And Modern Technology
Description: This is a Chapter in Physics about Modern technology