Write short note on generator in physic
Answers
Answer:
In electricity generation, a generator is a device that converts motive power (mechanical energy) into electrical power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines, wind turbines and even hand cranks.
Explanation:
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Answer:
Electric generators, also known as dynamos is an electric machine that converts mechanical energy into electrical energy. The electric generator’s mechanical energy is usually provided by steam turbines, gas turbines, and wind turbines. Electrical generators provide nearly all the power that is required for electric power grids.
Electrical Generators
The reverse conversion of electrical energy to mechanical energy is done by an electric motor. Both motors and generators have many similarities. But in this, the article let us focus mainly on electric generators and how they convert mechanical energy to electrical energy.
Explanation:
History of Electric Generators
Electrostatic generators were used before the relationship between electricity and magnetism was discovered. These generators operated on electrostatic principles. Electrostatic generators were never used for generation of commercially significant quantities of electric power due to the following reasons:
Due to the difficulty in insulating machines that produced high voltages
Due to the low power rating
Due to this inefficiency of electrostatic generators, the first electromagnetic generator, the Faraday disk, was invented in 1831 by British scientist Michael Faraday.
How do Generators create Electricity?
Generators do not create electricity instead it uses the mechanical energy supplied to it to force the movement of electric charges present in the wire of its windings through an external electric circuit. This flow of electrons constitutes the output electric current supplied by the generator.
The modern-day generators work on the principle of electromagnetic induction discovered by Michael Faraday. He realized that the above flow of current can be created by moving an electrical conductor in a magnetic field. This movement creates a voltage difference between the two ends of the conductor which causes the electric charges to flow, hence generating electric current.
Components of an Electric Generator
The main components of an electric generator are given below
The Frame – the structure
An Engine – the source of mechanical energy
The Alternator – produces an electrical output from the mechanical input
A Fuel System – to keep the generator operational
A Voltage Regulator – to regulate the voltage output
A Cooling System – to regulate heat levels that build up in the system
A Lubrication System – for durable and smooth operations over a span
An Exhaust System – to dispose of the waste exhaust gases produced in the process
A Charger – to keep the battery of the generator charged
Main Control – the control panel controlling generator interface
Types of Electric Generators
The classification of electric generators depends on the type of electrical energy that is produced, which is either direct current or alternating current.
AC generators: AC generators are known as single-phase generators and are limited to 25 kW.
DC generators: These generators are divided into three categories, and they are shunt, series, and compound-wound. Shunt generators are used in battery chargers. Series generators are used in street lights. While most of the DC generators are compound-wound.
If you wish to read more about AC Generators and DC Generators, click on the link below:
AC Generators
DC Generators
Uses of an Electric Generator
They provide the power for most power networks across cities
Small scale generators provide a good backup for household power needs or small businesses
At construction sites, before the power is set up, they extensively make use of electric generators
Energy-efficient as fuel consumption is reduced drastically
Since they give a range of voltage output, they are used in labs
They are used to drive motors
They are used in transportation