Mandy took a trip to rome, italy. once landed and inside the terminal, she turned her cell phone back on, but it was not charged. she found a charging station with a usb adaptor port. the usb was universal, providing 5 volts in any country you were in, and a small red led next to her phone's screen told her the phone was successfully charging. this usb port seemed to have very high amperage, meaning it charged her phone quickly. she was aware, though, that almost all of italy's electricity was generated by burning fossil fuels, and thus she was determined after this to use the portable solar charger she had bought rather than wall electricity.