AC is forever bobbing up and down either side of zero volts.

Feed it through a transformer and you change that voltage in the exact proportion to the number of turns in the primary and secondary coils. It is still bobbing up and down.

Bridge rectify it and you mirror the volts below zero volts so they show above zero volts. It is still bobbing up and down but only one way.

Add a capacitor, any capacitor and the volts will stabilise at peak volts because there is no load to pull it down.

Add a load and discover what the problem with transformers is... to sustain the voltage at something useable you need a snogging girt capacitor. Any load will reveal the bobbing, the capacitor merely determines the degree.

1 Farad will give 1 Amp for 1 second. Unfortunately capacitors are usually rated in micro Farads, millionths of a Farad.

You can get 1F capacitors but they are either for memory back up purposes of they are the size of a house.

If your drivers don't care about the Volts bobbing up and down when you apply a load then transformers are for you