Vrms stands for Root Mean Square. It’s a unit of measure for the electric voltage that almost invariably represents the average value of an alternating current over long periods of time. It can also be used to represent all sorts of other periodic waveforms such as sound waves, light pulses, and water waves.
The Vrms voltage is just that – the root-mean-square (RMS) voltage detected by a load connected to the power supply cable times its RMS current I(avg). The higher your DC RMS Voltage on your wall outlet or battery charger, the more power you will get out per amp input consumed from AC appliances connected to it assuming everything else remains fixed such as their Ohmic Resistance.
Vrms voltages typically range from a few volts on a laptop’s battery, to hundreds of volts in some mains electrical applications.
