Benjamin Franklin
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Transcript of Benjamin Franklin
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BENJAMIN FRANKLIN
The one and only.
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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, scientist, musician, inventor, satirist, civic activist, statesman and diplomat.
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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.
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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.
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BENJAMIN CONDUCTED HIS FAMOUS KITE EXPERIMENT TO PROVE THAT LIGHTNING WAS STATIC ELECTRICITY.
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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 Benjamin's 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.
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THE COOLING EXPERIMENT
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CONCEPT OF COOLING
• Benjamin observed that he stayed cooler in a wet shirt in a breeze than a dry one.
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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.
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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 Young's famous slit experiment where the scientific community was convinced.
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THANK YOU