Measure the mass of a block, the energy supplied and its temperature rise. Use an electric heater and joulemeter, or calculate supplied energy from power and time. Insulation and good thermal contact reduce energy losses; supplied energy can exceed the energy gained by the block. Example: Select a method for measuring supplied energy. Read a joulemeter, or measure power and heating time then use E = Pt. A correct answer needs an appropriate unit as well as a numerical value. Justify your answer.