Have you ever ponder on how your electronic devices retain energy via DC charger.........your laptops,phones,tablets all depends on Alternating current but they cnt withstand AC input instead, DC charger is used to slice & chop the current down......
There are three effective components in AC-DC adapter
1 Transformer
2 Bridge Rectifier (4 rectifier diodes)
3 Filter Capacitor

They works thus.....
The Transformer is commonly used to step down the applied AC mains via electromagnetic induction,while the voltage seems low, the #AC_mains require rectification filtration...Rectification is done by #THE_BRIDGE_RECTIFIER (comprised of 4 rectifier diodes) and this rectified voltage is further filtered by the preceding electrolytic #FILTER_CAPACITOR to then produce a clean DC output to then charge your devices.......
I'm way up to build a AC -DC circuit....I'll upload it for you to see......
#BOooom