Circuit arrangement and method for determining a resistance change and methods for determining lead resistances

In a circuit arrangement for determining a resistance change, a measuring resistor can be connected by first and second supply leads and first and second sensor leads in a four-wire arrangement, such that the first supply lead and the measuring resistor form a first resistor of a first voltage divider, and the second supply lead and a supplementary resistor form a second resistor of the first voltage divider. The circuit arrangement has a second voltage divider with third and fourth resistors. The first and second voltage dividers form a Wheatstone bridge. The circuit arrangement is configured to apply a supply voltage across the Wheatstone bridge, to determine first and second supply voltage drops across the first and second supply leads, and to determine an ascertainment voltage in proportion to a reference voltage. The ascertainment voltage depends on a bridge voltage applied between the first and second voltage dividers.