I wanted to make a simple power supply so I made a bridge rectifier with 4 diodes rated 6 amps, then I connected the bridge to a transformer (220 volts to 9 volts (measured 9.4 with voltmeter) 50 Hz) and when I measured the voltage after the bridge the output was 9.1 volts.
Then I added a 4700uF capacitor (50 volts) in parallel and when I measured the output voltage it was 13.8 volts but when I disconnect it, voltage is 9 volts again. I first thought that maybe the voltmeter is broken but when tested with an small motor it was actually running faster with the cap.
Is it pulling more pressure on the transformer to draw 13 volts or something? Because I'm really confused right now. By the way will it help if I use an smaller cap? Because that would increase the ripple voltage?