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Electrical Engineering QUESTION #2189
Question 1
A p-channel JFET has $I_{DSS} = -8\,\text{mA}$ and pinch-off voltage $V_P = +3\,\text{V}$. At $V_{GS} = 1.5\,\text{V}$ (saturation region), the drain current $I_D$ is:
  • $-2\,\text{mA}$✔️
  • $-4\,\text{mA}$
  • $-6\,\text{mA}$
  • $+2\,\text{mA}$
Correct Answer Explanation
$I_D = I_{DSS}\!\left(1-\frac{V_{GS}}{V_P}\right)^2 = -8\!\left(1-\frac{1.5}{3}\right)^2 = -8\times(0.5)^2 = -8\times0.25 = -2\,\text{mA}$. Negative sign confirms conventional current flows from source to drain in p-channel device.