Penneistä jännitettä. Voltage from old Finnish copper and aluminum pennies.

#Electrochemistry
#DIYScience
#PhysicsDemo
#HighSchoolPhysics
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#CoinBattery
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Great Lakes Select Button Cell and Coin Battery PACKAGES Are Not Child-Safe. These batteries are not sold in child-resistant packaging and do not include the warning labels required under Reese’s Law. #greatlakes #buttonbattery #coinbattery #children #burns #recall