Lanterna: tamb\u00e9m conhecida como tocha, \u00e9 um instrumento eletr\u00f4nico de ilumina\u00e7\u00e3o port\u00e1til. Uma lanterna t\u00edpica possui uma l\u00e2mpada alimentada por bateria e um espelho de foco, al\u00e9m de um corpo em formato de al\u00e7a para uso port\u00e1til. Embora tenha um design bastante simples, s\u00f3 foi inventada no final do s\u00e9culo XIX, pois precisava combinar a inven\u00e7\u00e3o da bateria com a l\u00e2mpada. No in\u00edcio, era chamada de "flashlight" em ingl\u00eas porque a energia da bateria era insuficiente, o que significa luz de curta dura\u00e7\u00e3o.<\/p>\n
O princ\u00edpio da lanterna: um polo da l\u00e2mpada da lanterna est\u00e1 em contato com o polo positivo da bateria, o outro polo da l\u00e2mpada est\u00e1 conectado a uma extremidade do interruptor e a outra extremidade do interruptor est\u00e1 conectada ao polo negativo do interruptor. Quando o bot\u00e3o do interruptor \u00e9 pressionado, a bateria forma um circuito em s\u00e9rie com a l\u00e2mpada atrav\u00e9s do interruptor, e a corrente da bateria passa pelo filamento de tungst\u00eanio da l\u00e2mpada, fazendo com que ela aque\u00e7a at\u00e9 um estado incandescente e emita luz.<\/p>\n
A distin\u00e7\u00e3o entre lanternas boas e ruins:
\n1. Bateria para lanterna. Existem dois tipos de bateria: bateria de n\u00edquel e bateria de l\u00edtio, que podem ser selecionadas de acordo com a situa\u00e7\u00e3o.
\n2. L\u00e2mpadas. Quando a l\u00e2mpada est\u00e1 apagada, \u00e9 dif\u00edcil a olho nu distinguir se est\u00e1 boa ou ruim. Voc\u00ea pode ver a consist\u00eancia da l\u00e2mpada quando ela est\u00e1 acesa.
\n3. Abertura. A abertura de uma boa lanterna LED \u00e9 um c\u00edrculo uniforme, enquanto o ponto de luz de uma lanterna LED de baixa qualidade \u00e9 dividido em duas cores, amarelo e azul, que s\u00e3o distribu\u00eddas de forma desigual.
\n4. Brilho. Uma boa lanterna de LED tem alto brilho e decaimento lento.
\n5. \u00c0 prova d'\u00e1gua. Uma boa lanterna de LED possui fun\u00e7\u00e3o \u00e0 prova d'\u00e1gua e boa resist\u00eancia a choques, ou seja, \u00e9 resistente a quedas.<\/p>","protected":false},"excerpt":{"rendered":"
Torch: also referred to as torch, is a handheld electronic lighting tool. A typical flashlight has a battery-operated bulb and 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