經典課堂笑話
3mm LED第一個:高中時全校必須穿校服,有一復讀的學生從來都不穿。管這方面的老師天天蹲在門口檢查。一日,老師看到此同學沒穿校服,問其為什麼不穿。此同學大怒,曰:我媽又沒死,為什麼要穿孝服?第二個:一個美術老師小有名氣,某報上有較大篇幅報道,並附照片,於是在課上自吹:“最近總有同學和我說,老師你真行Red, Yellow, Green and Orange Led's works on 1.8 to 2 volts, White, Blue and Purple need 3 to 3.5 volts for proper operation. All 3mm LED's operate on 20ma except 3mm Flashing that work on 10 ma, A current limiting resistor should be used when lighting LE...
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