The Experiments (Known Today as Research)

 

Paddle Wheel Experiment

James Joule's Paddle Wheel Experiment determined the existence of a relation between heat and mechanical work. He established this by a method involving the churning water in a calorimeter by means of paddles driven by various falling weights. Through this experiment James Joule established what we call today the First Law of Thermodynamics.

See the Paddle Wheel Experiment in action with the "Virtual Experiment":

 

The First Law of Thermodynamics

"The First Law of Thermodynamics" is sometimes known as the law of conservation of energy. This law states that energy cannot be created nor destroyed; it can only be converted from one form to another.

 

 

Joule's Law

Joule's law gives that the amount of heat Q liberated by current I flowing through a resistor with resistance R for a time t.

 

 

Joule-Thomson Effect

The Joule-Thomson effect is named after James Prescott Joule and William Thomson (Lord Kelvin).
This experiment is based on the fact that non-ideal gasses exhibit cohesion. When these gasses are expanded, the interactions end. This will generally cost energy. This energy is drained from the environment causing it to cool down.
The effect is commonly observed in spray cans (deodorant, paint) but is also used in refrigerators and air-conditioners.