A USB socket will charge a USB-compatible device faster than a traditional outlet because it gets more current than a standard will charger. For example, a standard power outlet typically delivers up to 5 volts at 1,000 milliamps. In contrast, a USB power point can deliver up to 5 volts at 3,000 milliamps. Don’t worry if you’re not big on maths (we don’t blame you), that just means a USB-designed outlet will charge your smartphone, tablet or device significantly faster than a traditional outlet.