A feeding device for supplying an appliance which can be moved on a driving surface with a material which can be fed through a feeding line, in particular a pipeline, having • a plug with at least one electric plug contact element, which extends towards the free plug end along a plug axis and which can be coupled to a plug receptacle of the mobile appliance by a linear joining movement, and • a feeding line with a valve, wherein the feeding device detects a coupled state of the plug with the plug receptacle by means of an electric plug contact element and, based thereon, makes the valve of the feeding line actuatable, characterized in that the feeding device has a nozzle, a feeding holder, a movement apparatus and a detection system, wherein • the nozzle is arranged on the feeding line and runs towards the free nozzle end along a nozzle axis and can be coupled to an inlet port of the mobile appliance, • the feeding holder holds the nozzle and the plug in a defined position and alignment relative to each other such that when the plug is coupled to the plug receptacle, the nozzle is coupled to the inlet port, • the movement apparatus makes the feeding holder with the plug and nozzle at least height adjustable and movable in the direction of the joining movement along a joining axis, • the detection system is configured to establish a position and alignment of the plug receptacle based on the detection features of the plug receptacle, and • the feeding device is designed, based on the established position and alignment of the plug receptacle, to couple the plug to the plug receptacle by a linear joining movement along the joining axis and, as a result, to couple the nozzle to the inlet port. • a plug with at least one electric plug contact element, which extends towards the free plug end along a plug axis and which can be coupled to a plug receptacle of the mobile appliance by a linear joining movement, and • a feeding line with a valve, wherein the feeding device detects a coupled state of the plug with the plug receptacle by means of an electric plug contact element and, based thereon, makes the valve of the feeding line actuatable, characterized in that the feeding device has a nozzle, a feeding holder, a movement apparatus and a detection system, wherein wherein the feeding device detects a coupled state of the plug with the plug receptacle by means of an electric plug contact element and, based thereon, makes the valve of the feeding line actuatable, characterized in that the feeding device has a nozzle, a feeding holder, a movement apparatus and a detection system, wherein • the nozzle is arranged on the feeding line and runs towards the free nozzle end along a nozzle axis and can be coupled to an inlet port of the mobile appliance, • the feeding holder holds the nozzle and the plug in a defined position and alignment relative to each other such that when the plug is coupled to the plug receptacle, the nozzle is coupled to the inlet port, • the movement apparatus makes the feeding holder with the plug and nozzle at least height adjustable and movable in the direction of the joining movement along a joining axis, • the detection system is configured to establish a position and alignment of the plug receptacle based on the detection features of the plug receptacle, and • the feeding device is designed, based on the established position and alignment of the plug receptacle, to couple the plug to the plug receptacle by a linear joining movement along the joining axis and, as a result, to couple the nozzle to the inlet port.