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 Credits Electrochemical 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