BENJAMIN FRANKLIN • Benjamin Franklin lived from 17 January 1706 to 17 April 1790. • Benjamin was the 6th president of Pennsylvania and was one of the Founding Fathers of United States. • Franklin had many professions, he was a leading author, printer, political theorist, politician, postmaster, scientis t, musician, inventor, satirist, civic activist, statesman and diplomat.
BENJAMIN FRANKLIN• Benjamin’s electricity discoveries and theories have contributed a lot to the history of physics.• Franklin invented the lightning rod, bifocals, the Franklin stove, a carriage odometer, and the glass armonica.
THEORY ON ELECTRICITY• Electricity is a form of energy that results from the flow of charged particles.• Benjamin Franklin was the first to label electricity under different pressures as positive and negative respectively.• Franklin was also the first one who discovered the principle of conservation of charge.
BENJAMIN CONDUCTED HIS FAMOUS KITE EXPERIMENTTO PROVE THAT LIGHTNING WAS STATIC ELECTRICITY.
HIS FAMOUS KITE EXPERIMENT• Benjamin tied an iron key to the end of a silk string and inserted a thin metal wire that was tied to the key to a Leyden jar.• When the thunder storm cloud passed over Benjamins kite, the negative charges in the cloud in the form of lightning passed onto his kite and down into the Leyden jar.• Benjamin then confirmed that lighting was static electricity.
THE COOLING EXPERIMENT
CONCEPT OF COOLING• Benjamin observed that he stayed cooler in a wet shirt in a breeze than a dry one.
STEP BY STEP EXPERIMENT THAT BENJAMIN CONDUCTED• Ben continually wet the ball of a mercury thermometer with highly volatile liquids such as solvents.• With each subsequent evaporation, heat is lost and the temperature decreased to -14 degrees eventually while the room temperature is still 18 degrees.• Franklin was able to decrease the temperature of objects and reduce its heat via evaporation of highly volatile liquids below their freezing points.
WAVE THEORY OF LIGHT• Ben was the only major scientist who supported Christiaan Huygens wave theory of light.• It was basically ignored by the rest of the scientific community.• The theory was proved to be true; but only after Youngs famous slit experiment where the scientific community was convinced.