Guia simples para a tecnologia de produção e captação de energia para o futuro
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A capta��o de energia - tamb�m conhecida como capta��o de energia, recupera��o de energia ou energia ambiente - � o processo pelo qual a energia � derivada de fontes externas (por exemplo, energia solar, energia t�rmica, energia e�lica, gradientes de salinidade e energia cin�tica, tamb�m conhecida como energia ambiente), sendo depois armazenada para utiliza��o por pequenos dispositivos aut�nomos sem fios, como os utilizados em eletr�nica vest�vel, monitoriza��o de condi��es e redes de sensores sem fios. Normalmente, fornece uma quantidade muito pequena de energia para a eletr�nica de baixo consumo. Enquanto o combust�vel de entrada para alguma produ��o de energia em grande escala custa recursos (petr�leo, carv�o, etc.), a fonte de energia para os colectores de energia est� presente como fundo ambiente. Por exemplo, existem gradientes de temperatura resultantes do funcionamento de um motor de combust�o e, nas zonas urbanas, existe uma grande quantidade de energia electromagn�tica no ambiente devido �s emiss�es de r�dio e televis�o. Um dos primeiros exemplos de utiliza��o da energia ambiente para produzir eletricidade foi a utiliza��o bem sucedida da radia��o electromagn�tica (REM) para gerar o r�dio de cristal. Os princ�pios da recolha de energia a partir de EMR ambiente podem ser demonstrados com componentes b�sicos.
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