Friday 18 November 2016
Thursday 17 November 2016
USES OF PLANE AND CONCAVE MIRRORS
1. Plane mirrors are used as looking glass.
2. Plane mirrors are used by barbers to show front and back side of the customer head
3. Plane mirrors are used by scouts for signalling and also for army personnel.
4. Plane mirrors are used by the opticians to provide false dimension when their place of work is very small.
5. Plane mirrors are used for providing false dimensions in displaying jewellery, show cases, wrist watches, etc. These plane mirrors are fixed such that their mirrors are opposite to each other.
6. When the plane mirrors are opposite to each one, then they form multiple images, which makes a person happy by looking multiple images.
7. Plane mirrors are also used in cooking where the solar cookers are used.
8. Plane mirrors are used in making kaleidoscope.
uses of concave mirrors
1. concave mirrors are also used in solar cookers.
2. concave mirrors are used as a shaving mirror. The fundamental principle is when the object is in between pole of mirror and principal focus, then the image formed is virtual and erect and magnified (enlarged) image is formed, in this way the person image gets magnified.
3. Concave mirrors are also used as reflectors, generally concave mirrors are used in cars, trucks, motor bikes, in all these bikes, the bulb is placed at the principal focus of the concave reflector then a powerful parallel beam of light is formed.
4. Concave mirrors are used by doctors, especially by the doctors where we undergo examination for ear, throat, nose, teeth, etc. We observe at dentists, these are used to see the back of the tooth by placing it behind the tooth. Then a virtual, erect and enlarged image is formed.
Wednesday 16 November 2016
electric motor
how to make an electric motor at home easily
INTRODUCTION:
Electric current is nothing but net amount of charge flowing
through unit area of cross section of a conductor per unit time. As we know that electrons possess negative
charge that is electrons are negatively charged particles. When these electrons are flowing through any
electrical conductor, there is a development of magnetic field surrounding to
the conductor. When this conductor is placed in any external magnetic field,
then there is action of magnetic force on the conductor. This force causes the moment of the conductor
in the magnetic field. This principle is
applied in an electric motor. In this
motor, instead of a single long conductor, we use to take a rectangular coil,
which is usually placed in a strong magnetic field. This coil is rotated in the magnetic field,
due to the flow of current. Which is
usually rotated in magnetic field, this rotation of coil is utilized as
mechanical energy. This mechanical
energy is utilized for various purposes at home.
This
concept reveals electromagnetic induction.
As discussed, when electric current passes through the coil, magnetic
field is developed, and the coil also acts like a magnet. The two faces of the
coil acts like magnetic poles, on one side it acts like a north pole and
another side it acts like a south pole.
Hence, the current passing coil acts like a magnet.
Materials required:
1) A
Wooden platform
2) 9v battery
3) Metallic strips
4) Non insulated copper wire
5) Key to on/off the circuit
Procedure:
The circuit diagram consists of the construction part of
electric motor. Take a 9v battery,
connect to the metallic strips which is connected to a circular coil and the
two ends of the circular coil are connected to the metallic strips. Above the battery, a strong magnet should be
placed.
Working: When the circuit is closed, the current starts
flowing through the metallic strips. The
coil acts like a strong magnet consisting two poles, and this is repelled by
the external magnet, with which the net force acts on the coil, by which the
coil gets rotated, the continuous rotation of coil is utilized in our daily
life as electric water motor, water pump, mixture, etc.
USES:
Electric motor is a device which converts electrical energy
into mechanical energy, this principle is applied in our daily life at
different situations.
courses/admissions
*** VIT BUSINESS SCHOOL is inviting applications for admissions into MBA 2017
LAST DATE: 15th march, 2017
to apply online and for more details:
www.vit.ac.in or www.bschool.vit.ac.in
*********************
INSTITUTE OF PUBLIC ENTERPRISE, Shamirpet, Hyderabad is inviting applications for admission into Post graduate diploma in management, PGDM - Banking insurance and financial services, PGDM-International business, PGDM-Retail marketing, PGDM-Human resource management, PGDM-Executive
************for the year 2017-19
********************************************************
LAST DATE: 15th march, 2017
to apply online and for more details:
www.vit.ac.in or www.bschool.vit.ac.in
*********************
INSTITUTE OF PUBLIC ENTERPRISE, Shamirpet, Hyderabad is inviting applications for admission into Post graduate diploma in management, PGDM - Banking insurance and financial services, PGDM-International business, PGDM-Retail marketing, PGDM-Human resource management, PGDM-Executive
************for the year 2017-19
********************************************************
scholarships
02:03
No comments
build India scholarship from L&T constructions from engineering graduates
eligibility is engineering graduates to be passed out to be in 2017 and 60% of marks should be secured from tenth class to engineering level
selection procedure is ...subject test and aptitude test and interview
scholarship is 13,400/- rupees per month
last date is 28th Nov.
Sunday 13 November 2016
LEARN COMPUTEER
computer fundamentals
COMPUTER
is an electronic device which takes input from the user
through an input device, process the data through central processing unit (unit), and gives the output called information through output device.
Examples of input device:
Keyboard, ….keyboard consists of letters, numbers, special
characters and functional keys.
Keyboard is used to feed the data for various purposes.
Exampeles of output
device:
VDU….visual display unit,
which is used to display the processed data, the information produced is
meaningful and user friendly .
computer knows only machine language. we need to convert high level language into machine language. Machine language is in binary digits 0's and 1s. Any thing what we are giving as input is converted into binary form.
PROGRAM: A set of instructions is called a program.
HIGH LEVEL LANGUAGES : Earlier days we have COBOL, BASIC, etc. But now a days every one is using Python, C, C++, etc. due to requirement and necessity of the people we are shifting to new languages.
IN OUR TUTORIAL, WE ARE PROVIDING VIDEOS ALSO TO UNDERSTAND CLEARLY.
how a computer can understand us ?
computer knows only machine language. we need to convert high level language into machine language. Machine language is in binary digits 0's and 1s. Any thing what we are giving as input is converted into binary form.
PROGRAM: A set of instructions is called a program.
HIGH LEVEL LANGUAGES : Earlier days we have COBOL, BASIC, etc. But now a days every one is using Python, C, C++, etc. due to requirement and necessity of the people we are shifting to new languages.
IN OUR TUTORIAL, WE ARE PROVIDING VIDEOS ALSO TO UNDERSTAND CLEARLY.
Saturday 12 November 2016
dictionary of physics
Aberration
|
Aberration is a defect in the
image which is not a true picture of the taken object.
|
Abrasion
|
A
Phenomenon of wearing off because of friction
|
Absolute scale
|
The zero
of this scale of temperature corresponds to absolute zero.
|
Absolute zero
|
Zero of
thermodynamic temperature (0 kelvin)
|
Absorption hygrometer
|
A device
that is used for measuring the humidity of air
|
Acceleration due to gravity(g)
|
It is the
uniform acceleration produced in a freely falling body due to the
gravitational pull of the earth.
|
Accumulator
|
A type of
voltaic cell or battery that can be recharged by passing a current through it
from an external d.c. supply.
|
Acceleration (a)
|
The rate
of change of speed or of velocity
|
Accelerator
|
A machine
used for producing high energy charged particles and studying nuclear
reactions.
|
Acceptor
|
Materials
that are used for doping semiconductors whose atoms accept electrons form
neighbouring atoms known as host
|
Achromatic colour
|
A colour
that has no colour
|
Acoustics
|
Refers to
the study of the production and properties of sounds
|
Actinometer
|
Referes to
any of various instruments for measuring the intensity of electromagnetic
radiation.
|
Active device
|
An
electronic component such as a transistor that is capable of amplification
|
Adapter
|
A device
that is used for connecting parts of different size and shape
|
Admittance
|
It is a
measure of the ability of a circuit to conduct an alternating current.
|
Adsorption
|
The
process of formation of a layer of molecules of one substance on the surface
of a solid
|
Aerial
|
The part
of a radio system that transmits energy into or receives from the atmosphere
or space
|
Aerosol
|
A
colloidal dispersion of a solid or liquid in a gas
|
Air brakes
|
A system
of brakes that is operated by compressed air
|
Air conditioner
|
A device
that is used for reducing temperature and humidity of air in an enclosed
space
|
Air
|
It is a
gaseous mixture that surrounds the earth.
|
Alcohol thermometer
|
A
liquid-in-glass thermometer that uses ethanol as its working substance.
|
Allotropy
|
The
existence of a solid substance in different physical forms.
|
Alloy
|
A mixture
of two or more metals or of a metal with small amounts of non-metals.
|
Alnico
|
Used to
make permanent magnets.
|
Alternating current (A.C.)
|
A current
which flows alternately in one direction, then in the opposite direction
around a circuit.
|
Alternating voltage
|
The
voltage whose magnitude and direction change with time and after a certain
time the voltage recur with the same magnitude and in the same direction is
called alterating voltage
|
Amalgam
|
An alloy
of mercury with one or more other metals
|
Ammeter
|
A meter
used to measure electric current.
|
Ampere
|
The ampere
is the practical unit of electric current.
|
Ampere-hour
|
It is a
unit of quantity of electricity
|
Amplifier
|
An
electronic device that is used to increase the strength of an input signal
applied to it.
|
Amplitude
|
The
maximum value of a varying quantity from its mean value
|
Analyser
|
A device
for determining the plane of polarization of plane-polarized radiation
|
Anelasticity
|
It is the
property of a solid wherein stress and strain are not uniquely related in preplastic
range.
|
Anemometer
|
It is a
device that is used to measure the speed of wind.
|
Aneroid Barometer
|
It is a type
of barometer
|
Angle of refraction
|
The angle
between a refracted ray and the normal to the surface at the point of
refraction
|
Angstrom
|
Unit of
length
|
Angular displacement
|
Refers to
the angular or rotational displacement
|
Angular frequency
|
It is equal
to the number of complete rotations made by an object per unit time
|
Angular velocity
|
It is the
rate of change of angular displacement
|
Anion
|
Negatively
charged ion
|
Annealing
|
The
process of heating a solid to a temperature below the melting point.
|
Annular space
|
The space
between two rings (inner and an outer)
|
Anode
|
The
electrode that is a positive potential with respect to the cathode.
|