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Conductivity Showdown

Electromagnetism

★Exhibit Content: Differences in Material Conductivity ★Interaction: Electromechanical Interaction ★Operation: Select the corresponding material, connect it into the circuit; compare the changes in the light bulb. ★Exhibit Description: The exhibit consists of LED lights and conductive objects made of different materials. Visitors move the slider to connect the material into the circuit and observe the LED display to determine the conductivity of the object. ★Scientific Principle: The ability of an object to conduct electricity: Generally, metals, semiconductors, electrolyte solutions or molten electrolytes, and some non-metals can conduct electricity. The conductivity of non-electrolyte objects is determined by the number of free electrons in the outer shell of their atoms and their crystal structure. For example, metals contain a large number of free electrons and thus conduct electricity easily, while most non-metals have few free electrons and therefore do not conduct electricity easily. Graphite conducts electricity, while diamond does not, due to their different crystal structures. Electrolytes conduct electricity because ionic compounds, when dissolved or molten, produce positive and negative ions, thereby acquiring conductivity.

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