Abstract: A rack used in a device for preparing or analyzing a sample is provided. The rack includes, but is not limited to, a base, a plurality of walls extending from the base, a plate extending between the plurality of walls opposite the base, and a wireless power conductor. The plate includes, but is not limited to, a plurality of cavities. Each cavity of the plurality of cavities is configured to hold a receptacle that is configured to hold a liquid for analysis of a sample or each cavity of the plurality of cavities is configured to hold the liquid for analysis of the sample. The wireless power conductor is mounted to the base and is configured to receive energy by electromagnetic induction from a second wireless power conductor.