The Energy Transfer – Calorimeter includes two nested aluminum cups with an air space in between for insulation. While most calorimeters use a coil to heat the water, PASCO’s design features a 10 Ω heating resistor mounted to a circuit board. Using temperature, voltage, and current sensors, students can investigate the relationship between the input energy and heat transfer into the water.
https://www.pasco.com/products/lab-apparatus/thermodynamics/equivalent-of-heat/et-8499#specs-panel