Fontes de energia, precisamos de todas elas!
Autor: Elisabete Trentin | Publicado: 2011-09-05T12:52:00-07:00

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Fontes
Renováveis e Não-Renováveis de Energia

A renovabilidade de uma fonte é medida em relação ao tempo de vida do
ser humano. Uma fonte de energia renovável pode ser abastecida, ou se
desenvolver, dentro de um intervalo de tempo útil para as pessoas. Temos como
exemplos: a comida, a madeira, o carvão vegetal, a
água, a energia solar e o vento.

Por outro lado, uma fonte de energia não-renovável tem sua
formação tão lenta, a ponto de se tornar esgotável num intervalo de tempo
comparável à existência humana, não conseguindo ser reposta rapidamente. O carvão mineral, o petróleo e seus derivados, o gás natural
e os combustíveis nucleares são recursos não-renováveis.





Fontes
Convencionais e Alternativas de EnergiA

Fonte convencional
de energia é a designação usada para aquela
fonte cujas tecnologias de conversão de energia de uma forma em outra estão
plenamente desenvolvidas, e cujos custos são considerados economicamente
aceitáveis; tal fonte é utilizada na produção de energia a nível comercial. No
Brasil, são fontes convencionais as usinas hidrelétricas
e termelétricas (para produção de energia elétrica), a lenha, o petróleo, etanol e os alimentos (para
produção de energia química).

Ao contrário, a fonte
não-convencional ou fonte alternativa de energia tem tecnologias ainda não
completamente desenvolvidas; apresenta problemas de aceitação pela sociedade,
quase sempre por razões econômicas. É chamada de fonte alternativa porque é
usada como uma alternativa para ajudar as fontes convencionais na produção de
energia, como os coletores solares, os biodigestores e os geradores eólicos, marítimos e geotérmicos.