Sunday 20 November 2016
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Saturday 2 July 2016
Inside a dry cell battery
A battery contains electrochemical cells that can store chemical energy to be converted to electrical energy. Adry-cell battery stores energy in an immobilized electrolyte paste, which minimizes the need for water. Common examples of dry-cell batteries include zinc-carbon batteries and alkaline batteries.
Construction of the Fluorescent Lamp
A fluorescent lamp or a fluorescent tube is a low pressure mercury-vapor gas-discharge lamp that uses fluorescenceto produce visible light. An electric current in the gas excites mercury vapor which produces short-wave ultraviolet lightthat then causes a phosphor coating on the inside of thelamp to glow.
Explaining Different Types of Transformers
A transformer is an electrical device which, by the principles of electromagnetic induction,
transfers electrical energy from one electric circuit to another, without changing the frequency.
The energy transfer usually takes place with a change of voltage and current. Transformers
either increases or decreases AC voltage.
Transformers are used to meet a wide variety of needs. Some transformers can be several
stories high, like the type found at a generating station or small enough to hold in your hand,
which might be used with the charging cradle for a video camera. No matter what the shape
or size, a transformers purpose remains the same: transforming electrical power from one
type to another.
There are many different types of transformers in use today. This resource will take a closer
look at Power Transformers, Auto Transformers, Distribution Transformers, Instrument
Transformers, Isolation Transformers, Potential Transformers and Current Transformers.
transfers electrical energy from one electric circuit to another, without changing the frequency.
The energy transfer usually takes place with a change of voltage and current. Transformers
either increases or decreases AC voltage.
Transformers are used to meet a wide variety of needs. Some transformers can be several
stories high, like the type found at a generating station or small enough to hold in your hand,
which might be used with the charging cradle for a video camera. No matter what the shape
or size, a transformers purpose remains the same: transforming electrical power from one
type to another.
There are many different types of transformers in use today. This resource will take a closer
look at Power Transformers, Auto Transformers, Distribution Transformers, Instrument
Transformers, Isolation Transformers, Potential Transformers and Current Transformers.
How Transformers Work
It is important to remember that transformers do not generate electrical power; they transferelectrical power from one AC circuit to another using magnetic coupling. The core of the
transformer is used to provide a controlled path for the magnetic flux generated in the
transformer by the current flowing through the windings, which are also known as coils.
There are four primary parts to the basic transformer. The parts include the Input
Connection, the Output Connection, the Windings or Coils and the Core.
- Input Connections - The input side of a transformer is called the primary side
- because the main electrical power to be changed is connected at this point.
- Output Connections - The output side or secondary side of the transformer is
- where the electrical power is sent to the load. Depending on the requirement of
- the load, the incoming electric power is either increased or decreased.
- Winding - Transformers have two windings, being the primary winding and the
- secondary winding. The primary winding is the coil that draws power from the source.
- The secondary winding is the coil that delivers the energy at the transformed or
- changed voltage to the load. Usually, these two coils are subdivided into several coils in
- order to reduce the creation of flux.
- Core - The transformer core is used to provide a controlled path for the magnetic flux
- generated in the transformer. The core is generally not a solid bar of steel, rather a
- construction of many thin laminated steel sheets or layers. This construction is used to
- help eliminate and reduce heating.
Transformers generally have one of two types of cores: Core Type and Shell Type. - These two types are distinguished from each other by the manner in which the primary
- and secondary coils are place around the steel core.
- Core type - With this type, the windings surround the laminated core.
- Shell type - With this type, the windings are surrounded by the laminated core.
the primary winding. As the current flows, a changing magnetic field is set up in the
transformer core. As this magnetic field cuts across the secondary winding, alternating
voltage is produced in the secondary winding.
The ratio between the number of actual turns of wire in each coil is the key in determining
the type of transformer and what the output voltage will be. The ratio between output
voltage and input voltage is the same as the ratio of the number of turns between the two
windings.
A transformers output voltage is greater than the input voltage if the secondary winding has
more turns of wire than the primary winding. The output voltage is stepped up, and
considered to be a "step-up transformer". If the secondary winding has fewer turns than
the primary winding, the output voltage is lower. This is a "step-down transformer".
Transformer Configurations
There are different configurations for both single-phase and three-phase systems.- Single-phase Power - Single-phase transformers are often used to supply power for
- residential lighting, receptacle, air-conditioning, and heating needs. Single phase
- transformers can be made even more versatile by having both the primary winding
- and secondary winding made in two equal parts. The two parts of either winding can
- then be reconnected in series or parallel configurations.
- Three-phase Power - Power may be supplied through a three-phase circuit containing
- transformers in which a set of three single-phase transformers is used, or on three-
- phase transformer is used. When a considerable amount of power is involved in the
- transformation of three-phase power, it is more economical to use a three-phase
- transformer. The unique arrangement of the windings and core saves a lot of iron.
- Delta and Wye Defined - There are two connection configurations for three-phase
- power: Delta and Wye. Delta and Wye are Greek letters that represent the way the
- conductors on the transformers are configured. In a delta connection, the three
- conductors are connected end to end in a triangle or delta shape. For a wye, all the
- conductors radiate from the center, meaning they are connected at one common point.
- Three-phase Transformers - Three-phase transformers have six windings; three
- primary and three secondary. The six windings are connected by the manufacturer
- as either delta or wye. As previously stated, the primary windings and secondary
- windings may each be connected in a delta or wye configuration. They do not have
- to be connected in the same configuration in the same transformer. The actual
- connection configurations used depend upon the application.
Power Transformer
A power transformer is used primarily to couple electrical energy from a power supply line toa circuit system, or to one or more components of the system. A power transformer used with
solid state circuits is called a rectifier transformer. A power transformer's rating is given in
terms of the secondary's maximum voltage and current-delivering capacity.
Distribution Transformer
A pole-type distribution transformer is used to supply relatively small amounts of power toresidences. It is used at the end of the electrical utility's delivery system.
Autotransformer
The autotransformer is a special type of power transformer. It consists of a single, continuouswinding that is tapped on one side to provide either a step-up or a step-down function. This
is different from a conventional two-winding transformer, which has the primary and
secondary completely isolated from each other, but magnetically linked by a common core.
The autotransformer's windings are both electrically and magnetically interconnected.
An autotransformer is initially cheaper than a similarly-rated two-winding transformer. It also
has better regulation (smaller voltage drops), and greater efficiency. Furthermore, it can be
used to obtain the neutral wire of a three-wire 240/120-volt service, just like the secondary
of a two0winding transformer. The autotransformer is considered unsafe for use on ordinary
distribution circuits. This is because the high-voltage primary circuits are connected directly
to the low-voltage secondary circuit.
Isolation Transformer
An isolation transformer is a very unique transformer. It has a 1:1 turn's ratio. Therefore, itdoes not step voltage up or down. Instead, it serves as a safety device. It is used to isolate
the grounded conductor of a power line from the chassis or any portion of a circuit load.
Using an isolation transformer does not reduce the danger or shock if contact is made across
the transformer's secondary winding.
Technically, any true transformer, whether used to transfer signals or power, is isolating, as
the primary and secondary are not connected by conductors but only by induction. However,
only transformers whose primary purpose is to isolate circuits (opposed to the more common
transformer function of voltage conversion), are routinely described as isolation transformers.
Instrument Transformer
For measuring high values of current or voltage, it is desirable to use standard low-rangemeasuring instruments together with specially-constructed instrument transformers, also called
accurate ratio transformers. An accurate ratio transformer does just as the name suggests.
It transforms at an accurate ratio to allow an attached instrument to gauge the current or
voltage without actually running full power through the instrument. It is required to transform
relatively small amounts of power because it's only load, called a burden, is the delicate moving
elements of an ammeter, voltmeter or wattmeter.
There are two types of instrument transformers:
- Current - Used with an ammeter to measure current in AC voltages
- Potential - Used with a voltmeter to measure voltage (potential difference) in AC.
Current Transformer
A current transformer has a primary coil of one or more turns of heavy wire. It is alwaysconnected in series in the circuit in which current is to be measured. The secondary coil is made
up of many turns of fine wire, which must always be connected across the ammeter terminals.
The secondary of a current transformer must never be open-circuited. This is because the
primary is not connected to a constant source. There is a wide range of possible primary
voltages, because the device can be connected to many types of conductors. The secondary
must always be available (closed-circuited) to react with the primary, to prevent the core from
becoming completely magnetized. If this happens, the instruments will no longer read
accurately.
A clamp-on ammeter works in a similar way. By opening the clamp and placing it around a
current carrying conductor, the conductor itself acts as a single turn primary. The secondary
and the ammeter are conveniently mounted in the handle of the device. The dial allows a
number of current ranges to be gauged accurately.
Current Transformers are a type of instrument transformers. They are used for the measurement of electric currents.
Potential Transformer
A potential transformer is a carefully designed, extremely accurate step-down transformer. It isnormally used with a standard 120-volt voltmeter. By multiplying the reading on the voltmeter
(called the deflections) by the ratio of transformation, the user can determine the voltage on
the high side. Common transformation ratios are 10:1, 20:1, 40:1, 80:1, 100:1, 120:1, and
even higher.
In general, a potential transformer is very similar to a standard two-winding transformer,
except that it handles a very small amount of power. Transformers for this service are always
the shell type, because this construction has been proven to provide better accuracy.
Potential Transformers (like the one pictured above) are designed for monitoring single-phase
and three-phase power line voltages in power metering applications.
Types of Transformers
Transformers generally have one of two types of cores:
1)Core Type and ,
2)Shell Type.
These two types are distinguished from each other by the manner in which the primary and secondary coils are place around the steel core.
1)Core Type and ,
2)Shell Type.
These two types are distinguished from each other by the manner in which the primary and secondary coils are place around the steel core.
- Core type - With this type, the windings surround the laminated core.
- Shell type - With this type, the windings are surrounded by the laminated core.
Tesla Coil
A Tesla coil is an electrical resonant transformer circuit invented by Nikola Tesla around 1891. It is used to produce high-voltage, low-current, high frequency alternating-current electricity. Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits.
Tesla used these coils to conduct innovative experiments in electrical lighting, phosphorescence, X-ray generation, high frequencyalternating current phenomena, electrotherapy, and the transmission of electrical energy without wires. Tesla coil circuits were used commercially in sparkgap radio transmitters for wireless telegraphy until the 1920s and in medical equipment such aselectrotherapy and violet ray devices. Today their main use is for entertainment and educational displays, although small coils are still used today as leak detectors for high vacuum systems.
Friday 1 July 2016
Thursday 30 June 2016
Components of Transmission Line
What Are the Components of Transmission Lines?
Transmission towers (support structures) keep the high-voltage conductors (power lines) separated from their surroundings and from each other. They can be open lattice metal structures or one or more wood or metal poles. Height can be over 150 feet with crossarms as much as 100 feet wide.
Conductors are metal wires, cables, and bus-bars used for carrying electric current. Conductors may be solid or stranded, that is, built up by an assembly of smaller solid conductors.
Internals of a drill Machine
| Inside an Electric Drill |
Many everyday jobs have been made easier by electric motors. We use electric mixers in the kitchen, electric vacuum cleaners to clean the house, electric tools in the shop, even electric motors to help start the gasoline engines in cars.
The photos below show the electric motor in a power drill. Can you see any parts which look or work like the electric motors you made in class? This motor uses a stationary coil and a moving coil so that its power comes from the interaction of two electromagnets. Do you see the gears which control how fast the drill bit moves?
end view
side view
close up view 
Electrical Wire Color Codes
Electrical wires follow standard color coding that helps classify each wire function in the circuit. In India wires are RGB mode i.e. Red- Green- Black. Each of these RGB wire have different functions.
Red – Red wire signifies the phase in electric circuit. It is the live wire which cannot be connected to another red wire or black wire. Red is used in some types of switch leg. Switch leg is the wire that comes off from the bottom terminal of a switch and when the switch is turned on becomes hot. This is the leg that turns the load off and on.
Black – Black wires signifies neutral wire in electric circuit. The neutral wires is connected to neutral bus bar inside an electric panel. A bus bar is and conductive metal bar that attracts the electric current for distribution purpose.) Black wire can be connected to black wire only and no other color wire. Black wire being neural, it does carry charge/current. It mainly carries the unbalanced load i.e. the return current that we call. Return current is the electricity/current not being used and the return current to the electrical board/panel.
Green – Green wire stands for grounding/ earthing in electric circuit. A green wire should be on can be connected to green wire only (no other wire). Grounding wires are usually not meant for lights and fan purposes. Green wires are chiefly used for socket purpose. Socket could be for AC, geyser, TV, microwave, etc. Normally, switches have only 2 wires i.e. neutral and phase.
In a room/ apartment there could be several sockets for use. The grounding wire from all these sockets get connected at one single point/grounding terminal in an apartment. This grounding terminal is a copper rod/screw that is connected to the DB (distribution box) on one of the sides. From the DB, the wire runs to the society meter box which then runs to the ground bus bar. The ground bus bar is the copper plate inserted deep down inside the ground. This is called as earthing in common language. The function of green wire is to provide a path to ground for circuit’s electric current. Especially times when a live wire inside the circuit happens to touch metal or other conductive metal. Incase of this occurrence, green wire could be carrying major current and therefore it should also be handled with care.
Wednesday 29 June 2016
Sunday 29 May 2016
Friday 29 April 2016
Monday 25 April 2016
Utilization Of Geothermal Energy(Totally Innovative Idea Given By Billions in Change)
Energy straight from the core.
We can power the world with clean resources that are right under our feet.
INTRODUCTION
https://youtu.be/jD-_ACt7Q1U
THE PROBLEM
Limited Clean Energy
Burning fossil fuels and creating nuclear reactions to generate electricity comes at a high cost – politically and environmentally. Alternative methods are limited and come with tradeoffs. The answer to these problems is right under our feet.
https://youtu.be/DUfgcPwKKj4
THE SOLUTION
Our Solution: Limitless Energy
Not too far below the surface of the Earth, it’s hot. That heat can create enough clean energy to power the world, and help keep things cool above. Using cables made from graphene, a form of pure carbon 100 times stronger that steel, that heat can be conducted to the surface of the Earth to run turbines and generate electricity – without burning anything. We call it Limitless Energy.
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