This man is first alphabetically in the name of an effect that states when a gas expands without performing external work, the gas decreases in temperature.
John Benjamin Dancer designed several of the instruments used in this scientist's experiments. This man's namesake law states that the heat generated by a current through a conductor is proportional to the resistance and the square of the current. During the 1840s, this man used a water friction apparatus to prove the conservation of energy. This man is first alphabetically in the name of an effect that states when a gas expands without performing external work, the gas decreases in temperature. One calorie equals 4.184 of this man's namesake SI unit, which is often converted into kilowatt-hours. For 10 points, name this physicist who names the SI unit of energy.
John Benjamin Dancer designed several of the instruments used in this scientist's experiments.
James Prescott Joule 