Ch. 2 Sec. 3 Batteries

Luigi Galvani

• made frog leg move

• thought it was b/c of “animal electricity”

Luigi Galvani

Though Luigi Galvani

erroneously concluded that

the frog's nervous system

generated an electrical charge,

his work stimulated much research into the electrical nature of the nervous

impulse.

Alessandro Volta•Italian scientist who built 1st electric battery out of silver, zinc & paper soaked in salt H20

Alessandro Volta• Said that Galvani made frog leg move b/c of chemical reaction= process in which substances change into new substances w/ diff. properties

electrochemical cell

• Device that converts chemical energy electrical energy

• Made of 2 different metals (electrodes)–Partially immersed in an

electrolyte= device that conducts electric current

terminal• Part of an electrode above

surface of the electrolyte

battery•combination of 2 or more electrochemical cells in a series

•store chemical energy

2 kinds of electrochemical

cells:

1. wet cell•electrolyte = liquid

2. dry cell (alkaline)

•electrolyte = paste

Object Voltage 1 D battery

2 D batteries3 D batteries

Activity-Find the voltage