Positive SSL
BLOCK
BLOCK
1 如圖所示，為矽二極體，V=20V,R1=3.3kΩ,R2=5.6kΩ,求I2約為何值？
A 2.7mA
B 3.1mA
C 3mA
D 3.9mA
  

矽二極體導通0.7V壓降，將原電路轉換成如圖電路

流過 5.6kΩ 電阻電流 `I_(5.6k)` = `(20-0.7-0.7)/(5.6k)` = 3.32mA

流過 3.3kΩ 電阻電流 `I_(3.3k)` = `(0.7)/(3.3k)` = 0.21mA

`I_2` = 3.32-0.21 = 3.11mA