Current always exists as long as there is a potential difference between two bodies connected by a conductor, for example, but it has a short duration when these bodies are electrified by the methods seen in electrostatics, as they quickly come into equilibrium.
The way found to have a longer lasting potential difference is to create electric generators, which are built so that there is voltage over a longer period of time.
There are several types of electric generators, which are characterized by their working principle, some of them are:
These are power generation systems built to transform light energy into electrical energy, such as solar panels made of a silicon compound that converts the sun's light energy into electrical energy.
They are the most common generators with the highest power generation capacity. They transform mechanical energy into electrical energy, mainly through magnetism. This is the case of generators found in hydroelectric, thermoelectric and thermonuclear plants.
They are built in a way that can convert chemical potential energy into electrical energy (continuous only). This type of generator is very much found as batteries and batteries.
They are those capable of converting thermal energy into electrical energy directly.
When associated two or more generators as batteries, for example, the voltage and current behave in the same way as in the resistor associations, ie:
- Serial association: rated current and voltage is summed.
- Parallel Association: Current is summed and rated voltage.