the power supply system

when doing the design of a power supply system let us say like the 12VDC output, how is this possible provided that the house outlet is around 240VAC? this is actually disturbing me so much as I have a system that requires 12vdc for it to operate but I don't have such a power supply.
 
when doing the design of a power supply system let us say like the 12VDC output, how is this possible provided that the house outlet is around 240VAC? this is actually disturbing me so much as I have a system that requires 12vdc for it to operate but I don't have such a power supply.
If you continue your study of power electronics you will discover multiple methods for transforming both current and voltage from levels that are suitable for power transmission and distribution to levels that are suitable for various applications. Being 'disturbed' by all of this seems like a total overreaction. there are plenty of things that are disturbing, but this is hardly one of those things.
 
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