My friend says semi-conductors are used in transistor radios. What is a semi-conductor?
Conductors are substances that allow heat or electricity to flow easily through them; insulators on the other hand, stop the flow of heat or electricity. In addition, there are some substances that stop the flow of electricity but become less resistant to it in some conditions and then allow electricity to pass. These are the semiconductors.
Semiconducting materials have made possible modern computers and many other important electronic devices like solar cells and transistor radios.
Two well-known semiconductors are germanium and silicon.
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