Lampe de poche\u00a0: \u00e9galement appel\u00e9e torche, elle est un outil d'\u00e9clairage \u00e9lectronique portatif. Une lampe de poche classique est \u00e9quip\u00e9e d'une ampoule \u00e0 pile et d'un miroir de focalisation, ainsi que d'un bo\u00eetier en forme de poign\u00e9e pour une utilisation \u00e0 la main. Bien que de conception assez simple, elle n'a \u00e9t\u00e9 invent\u00e9e qu'\u00e0 la fin du XIXe\u00a0si\u00e8cle, car elle devait combiner l'invention de la pile et celle de l'ampoule. \u00c0 l'origine, on l'appelait \u00ab\u00a0flashlight\u00a0\u00bb en anglais, car la puissance de la pile \u00e9tait insuffisante, ce qui signifiait une lumi\u00e8re de courte dur\u00e9e.<\/p>\n
Principe de fonctionnement d'une lampe torche\u00a0: un p\u00f4le de l'ampoule est en contact avec le p\u00f4le positif de la pile, l'autre p\u00f4le est connect\u00e9 \u00e0 une extr\u00e9mit\u00e9 de l'interrupteur, et l'autre extr\u00e9mit\u00e9 \u00e0 son p\u00f4le n\u00e9gatif. Lorsque l'on appuie sur le bouton, la pile forme un circuit s\u00e9rie avec l'ampoule via l'interrupteur. Le courant de la pile traverse le filament de tungst\u00e8ne de l'ampoule, la faisant chauffer jusqu'\u00e0 l'incandescence et \u00e9mettant de la lumi\u00e8re.<\/p>\n
La distinction entre les bonnes et les mauvaises lampes de poche :
\n1. Pile de lampe de poche. Il existe deux types de piles\u00a0: nickel et lithium, qui peuvent \u00eatre s\u00e9lectionn\u00e9es en fonction de la situation.
\n2. Ampoules. Lorsqu'une ampoule est \u00e9teinte, il est difficile \u00e0 l'\u0153il nu de distinguer si elle est bonne ou mauvaise. On peut observer la stabilit\u00e9 de l'ampoule lorsqu'elle est allum\u00e9e.
\n3. Ouverture. L'ouverture d'une bonne lampe torche LED est un cercle uniforme, tandis que le point lumineux d'une lampe torche LED de mauvaise qualit\u00e9 est divis\u00e9 en deux couleurs, jaune et bleu, in\u00e9galement r\u00e9parties.
\n4. Luminosit\u00e9. Une bonne lampe de poche LED a une luminosit\u00e9 \u00e9lev\u00e9e et une att\u00e9nuation lente.
\n5. \u00c9tanche. Une bonne lampe de poche LED est \u00e9tanche et r\u00e9sistante aux chocs, c'est-\u00e0-dire aux chutes.<\/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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