Technical English

A battery is a device that stores electrical energy in the form of chemical energy and releases it when needed. It is typically made up of one or more electrochemical cells, which convert chemical energy into electrical energy. Batteries are used in a wide range of devices, from small electronic devices like watches and smartphones to larger systems like electric vehicles and renewable energy storage systems. They are classified into primary and secondary batteries, with primary batteries being disposable and secondary batteries being rechargeable. Primary batteries are typically used in low-drain devices and are not intended for recharging, while secondary batteries are designed for multiple use and can be recharged using an external power source 

Fuel is a substance that is burned or used to produce energy, typically in the form of heat or power. It is commonly used in vehicles, machinery, and power plants to generate the energy needed for various purposes.

Generators work by rotating a coil of wire in a magnetic field, causing a current to flow in the wire. A generator may be a huge spinning turbine powered by water, wind, steam, gas, or nuclear reactions, which sends electricity out through power lines to thousands of customers. But normally when we use the word, we're thinking of a small machine powered by gasoline or diesel, such as you might keep in your basement for those times when a storm knocks out your power, to create electricity right in front of your eyes. A special kind of generator called an alternator powers a car's electrical system (including its lights, power steering, etc.) while the car is running.

The workings of mechanisms involve the study and understanding of how various components interact to produce specific motions, functions, or behaviors within a system. This includes analyzing the structural arrangement, movement patterns, and energy transformations involved in achieving a desired outcome or behavior.

: a rotating machine that transforms electrical energy into mechanical energy

A piston is a piece inside an engine that moves up and down. It helps the engine by pulling in fuel, squeezing it, lighting it on fire, and pushing out leftover gases.

A pump is a device that moves fluids (liquids or gases), or sometimes slurries,[1] by mechanical action, typically converted from electrical energy into hydraulic energy.