Output voltage bridge rectifier with smooting capacitor higher

[robsims]

Hi, before rectifying an AC voltage coming from a transformer, my DMM reads 7,53 volts AC. After connecting a bridge rectifier and a smoothing capacitor my DMM reads 9,86 volts DC across the capacitor. Why is the voltage higher? 

[wasedadoc]

Hi, before rectifying an AC voltage coming from a transformer, my DMM reads 7,53 volts AC. After connecting a bridge rectifier and a smoothing capacitor my DMM reads 9,86 volts DC across the capacitor. Why is the voltage higher?

When reading AC the DMM is displaying the RMS value.  For a sine wave the peak is 1.4 (square root of 2) times the RMS value.  The rectifier charges the capacitor to almost the peak voltage.

[robsims]

Hi, before rectifying an AC voltage coming from a transformer, my DMM reads 7,53 volts AC. After connecting a bridge rectifier and a smoothing capacitor my DMM reads 9,86 volts DC across the capacitor. Why is the voltage higher?

When reading AC the DMM is displaying the RMS value.  For a sine wave the peak is 1.4 (square root of 2) times the RMS value.  The rectifier charges the capacitor to almost the peak voltage.

Many thanks. I knew it had something to do with the capacitor, because without the capacitor, the reading across the output from the bridge rectifier is 6,37 volts