Power supply is used to supply energy to the electrical load. So it is an electrical device that supplies power to the circuit. Usually, we have linear and switched sources.
The most used are the switched ones, as there is a switching control that adjusts according to the load, allowing the passage of only the voltage required by the load. In linear, the voltage passes through a transformer to reduce the voltage, then it passes through a rectifier and a filter.
It’s a simpler system, but it takes more energy to run. This is because it does not have the switch to deactivate it when there is already enough electricity to operate the device, it serves low power devices very well.
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