Method and device for adjusting a load current depending on the internal resistance

The invention relates to a method and a device for adjusting a load current during operation of a load that is connected via load terminals to a supply line of a power supply system. In this case, an internal resistance of the power supply system that is effective at the load terminals is determined and used for adjusting the load current. The basic concept of the present invention is based on the determination and monitoring of the internal resistance of the supplying power network in order to detect potential hazards at an early stage and to initiate appropriate corrective measures. On the basis of the determined internal resistance value, a statement can be made about the quality of the power supply system, such as for example a building installation, from the main distribution board via the supply line in the supplying line outlet to the load terminals.