A switch mode power supply (SMPS) is an electronic circuit that converts power using switching devices that are turned on and off at high frequencies. They store power during non-conduction states by storing energy in capacitors or inductors. Switches are used in most appliances. They are used to turn devices on or off, change the voltage of electrical current, and regulate the voltage from one device to another. A switch-mode power supply, also known as a switch-mode power supply or switching-mode power supply, is also a very popular choice for new power supplies.