原子粒,又叫電晶體,係半導體零件,用來放大或者轉換電子訊號。原子粒係半導體一塊,有最少三隻腳,即係電極,駁去出面電路。電壓或電流,會加諸響原子粒嘅一對極,咁就可以轉另一對極嘅電流流向。因爲咁,原子粒嘅對極,通常分輸入同輸出。加諸輸入一方嘅能量,可以遠遠少過輸出嘅。就係咁,用原子粒,可以以細控制大,咁就可以將細訊號放大。原子粒可以單丁咁出,但多數都埋響集成電路入便。
原子粒係現代砌電子儀器嘅元素,喺現代電子系統入便,無所不在。譬如原子粒收音機。
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