In comparison, active cooling allows the system to accept higher currents for longer periods of time. Designers can lower the temperature by allowing coolant to flow near the charging terminals. A cooling plate is attached to the bus bar adjacent to the charging terminal (or pin), so that the coolant can carry heat away through the cooling plate. With active cooling, the air around the socket becomes less important; that is, the temperature increase is only related to the temperature of the coolant and is largely independent of the ambient temperature.