donderdag 5 november 2009
Peltier in Action & Safety
The prototype is assembled with aluminium parts, held together with silicone. There are some wooden parts as well, mainly as isolator: between the hot plate and the cold one, at both ends of the batteries. The curved area is wrapped in tin foil for testing, as I'm unsure whether the silicone is safe for food consumption.On the tin foil, we can see chocolate, which has melted from the heat induced by the peltier plate within the spoon.
The second picture shows a measurement for voltage between both plates, which appears to be way less than 1/1000 V. Even the body of a human carries higher voltages. So, no safety hazards here, we won't be electrocuted! Note that the peltier plate operates around 5V, which is completely harmless anyway.
Peltier Principle
An electric current is caused by applying a certain voltage at the 2 cables. This current is nothing more than electrons flowing from one side to another. They transfer heat energy from one side to the other while moving. (Click the picture below to view the animation)
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