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Physics, 20.06.2020 20:57 henrymototero

O desafio de criar dispositivos elétricos cada vez mais eficientes e mais ecológicos está na ordem do dia. Exemplo disso são as lâmpadas LED que estão gradualmente a substituir as lâmpadas de incandescência e de outros tipos. As lâmpadas de incandescência eram feitas do metal tungsténio, enquanto as lâmpadas LED têm na sua constituição materiais semicondutores. A temperatura constante, um condutor metálico tem uma resistência elétrica constante (é chamado condutor óhmico). Mas, nos semicondutores, a resistência elétrica depende da diferença de potencial aplicada.
O gráfico seguinte indica como varia a corrente elétrica com a diferença de potencial, fornecida por uma fonte de tensão contínua, aplicada em dois condutores: um LED de baixa potência e uma lâmpada miniatura com filamento de tungsténio.
Selecione a opção que completa corretamente a frase. As partículas com carga elétrica que estão na origem da corrente elétrica em condutores metálicos são sobre os quais atuam forças elétricas, originadas pela fonte de tensão contínua, que os fazem mover

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