How Do Generators Make Electricity?

Generators are appliances used for power supply when there is a power outage to ensure activities continue as usual. Generators are a secondary electric power source in both industrial and residential use. Are you interested to know more about the generator? Read it here weldinghubs.

Generator components


The engine is regarded as the main component of a generator. It acts as a converter of mechanical energy to electricity. The amount of power output the generator supplies depends on the design and the size of the engine. The greater the size of the engine, the greater the power output. When purchasing a generator, it’s essential to get manufacturers’ details concerning the engine to get one that works best in your applications.

Ask about the fuel type of the engine. Generators operate on propane, gasoline, diesel, and even natural gas. With this kind of information, you are able to choose a generator with an engine that will work best. It is also essential to ask about the type of machine the generator operates on. You can choose between an overhead valve engine and an overhead valve engine. One advantage of considering an overhead valve engine is that it’s more durable than the non-overhead machine. It is user and environmentally friendly since it produces fewer emissions and noise. It’s a compact design and therefore saves on space.

Fuel system

On average, engine tank capacity should allow the machine operation up to 8 hours. Smaller generators have mounted fuel tanks, while large ones use external tanks installed elsewhere. The fuel tank has the following components.

  • The fuel pump operates electrically to transmit fuel to the tank from the primary storage.
  • The fuel injector is used to optimize the fuel to the combustion chamber.
  • A pipe connector is a supply system that connects the fuel tank to the engine. It has both supply and return lines from the tank to the engine and back.
  • The fuel system also has ventilation that prevents the buildup of vacuum and pressure when draining and refilling the tank to avoid blockage.
  • The system also has an overflow connection that prevents any overflow liquid from spilling on the generator and causing damage.


The alternator is the component that produces electrical output from the engine. It houses moving and stationary elements to convert mechanical input to electricity. Some parts include the rotor, the moving components, and the stator, the static component. In purchasing a generator, consider the type of housing it has. Some have metal, while others have plastic housing. A metal housing is preferable due to its durability. Get a generator with ball bearings other than need needle bearing.


The battery has a charger that ensures the generator is fully supplied with voltage for starting the generator. The voltage should not be too high or too low to ensure the battery is in its right condition. A battery made of stainless steel is durable and prevents corrosion.

Cooling system

When the generator is operating for long hours, some of its parts become very hot. A cooling system is essential to ensure heat is withdrawn in the process of operation. A ventilation system is also critical to a generator. There are various coolants used for generators, including water, hydrogen, fan, and standard radiators. Before using a generator, it’s essential to ensure the coolant level is checked for full operation.

Exhaust system

Exhaust gases need to be disposed of when the generator is in operation to withdraw toxic chemicals. The exhaust pipes should be made of quality materials to ensure there is no leakage of these chemicals into the environment as they may cause death.

Control panel

The control panel has the generator gauge, the electric starter, engine gauge, electric shutdown, and many other controls. The number of rules depends on the manufacturer of the generator.

Lubricating system

The lubricating system in a generator should be checked regularly to ensure the lubricating oil is enough to operate the moving parts effectively. It is advisable to change the oil after every 500 hours of operation. Checking any leaks is also essential.

How generators make electricity

AC electrical generators

  1. The stator, the stationary part, is the electromagnetic field that allows the rotor to rotate to produce the generator’s output voltage to operate efficiently. The rotor represents the armature.
  2. The brushes and the slip rings take the output voltage from the rotor. The rotating loop has a slip ring attached to it at the end, allowing the meetings to create electrical contact. The alternative current output is produced when the electromagnets rotate.
  3. AC generators are mostly used in appliances that require a lower power supply.

When considering getting an AC generator for large appliances, you need to get a rotating field generator. This is the most used generator where direct current passes through the brushes and the slip rings on the rotor.

DC generators

A direct current generator produces natural power. Faraday law operates with these generators. Placing a conductor in an electromotive force induces it. The current induced circulates on a path.

  1. The coils produce the electromagnetic field in a direct current generator.
  2. The rotor conductors rotate in the area to generate the electromotive force.

Direct generators are of two types, which are self-excited and separately excited.

Considerations when purchasing a generator

Before deciding on which generator to buy, consider the following factors.

Type of generator

There are different types of generators available in the market. There are wind turbine generators, small diesel generators, a bicycle dynamo, micro wind turbine, and many others. DC generators produce different power, which is measured in wattage. For example, the small diesel generators have 500 watts.


You need to determine the type of engine your generator will operate on. While other engines work on diesel others, run on propane. Consider the application of the generator to ensure it has the right capacity to function. Consider the control system the engine uses. The size of the machine should also be considered to ensure it fits the space you have.

Fuel capacity

What is the amount of fuel your tank can hold? The fuel tank capacity affects the running time. As you consider the generators fuel-efficient, ensure the tank can have enough fuel for your application.


Understanding how a generator operates is essential because it will not give you a hard time working on your applications.

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