# JFET self biasing

I'm learning JFET self biasing. what I've understood so far is the resistor R_s is used to create a bias voltage as shown. since no gate current flows that means no current in R_G so the potential of the gate is Zero because it is like connecting the gate with the zero potential (ground), then what is the purpose of the resistor R_G? they could have directly shorted the gate with ground, why this extra resistor?

• Why do you say no current in $R_G$? Jan 10, 2021 at 16:17
• @Hearth JFET is a voltage controlled device so is there any current in gate? I am not sure, I am learning Jan 10, 2021 at 16:18
• See the answer below. There's no (significant, DC) current into the gate, but there is still current in that resistor. Jan 10, 2021 at 16:24