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Electrochemistry
What is electrochemistry?
• Electro: – Electricity
• Chemistry:– Science that studies changes in matter
• Electrochemistry:– Using chemical reactions to generate
electricity
The Potato Battery
• An electrochemistry example• Able to generate a maximum of 0.8 V of
electricity• The electrons travel from the copper wire to
the zinc coated nail
+ - 0.8
Problem: LCD clocks require a 1.5 V battery
• How could we generate more electricity?
• Connect multiple potatoes together!• Two types of circuits:– Parallel – Series
In Parallel
• All positive terminals are connected together and all negative terminals are connected together.
• Increases amperage, not voltage
In Series
• Every positive terminal is connected to a different negative terminal.
• Increases voltage, not amperage
• LCD clocks need 1.5 V of electricity• One potato battery generates 0.8 V of
electricity• How should we make our potato clock?
Photo CreditsElectrochemical Cell. Retrieved at http://sphs.spusd.net/apps/classes
/show_assignment.jsp?classREC_ID=180029&start=0&pff=1&showAll=true&show=1000
All about circuits. Potato battery. Retrieved at http://www. allaboutcircuits. com/vol_6/chpt_3/16.html