Short note on: Joule experiment.

1.8kviews

written 7.8 years ago by

The main aim of Joules Experiment was to determine the relationship between the work done and the quantity of heat produced in mechanical system.

Construction and Working:

enter image description here

The layout of Joule's experiment is as shown in the figure.
Paddle wheel 2 was submerged in the heat-insulated vessel 1 to the walls of which vanes 3 were fastened, the vanes interfering with the motion of water due to rotation of the paddle.
Rotation was imparted to the paddle (stirrer) by the falling load 4 of weight G, connected to the paddle by means of a rope and pulley 5.
As the weight falls through a distance Δh, the work done by it (and, consequently, by the stirrer) is equal to the decrease in the potential energy of the weight GΔh.
The heat liberated in the water-filled vessel is calculated from the rise in water temperature, measured with a thermometer.

Importance of Joule’s Experiments:

Joule’s experiments conclusively established that heat is a form of energy.
Always the same amount of heat was produced by spending a given amount of mechanical work. It is immaterial what type of arrangement is used for doing mechanical work.
It defines the relationship between Joule and Calories.

ADD COMMENT EDIT