Mobile Charger

Product Details:

Switching power supplies is more efficient because linear power supplies lose more energy as heat. The output of the switching power supply was controlled by the control circuit. In contrast, linear power supplies are controlled by the response of the regulator circuit.
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Product Details:

AC DC Adapteris a type of external  power supply, often enclosed in a case similar to an AC plug. Other common names include wall wart, power brick, wall charger, and power adapter. 
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