In the following circuit, the current flowing through zener diode is

Step-by-step solution

The voltage drop across R₂ is V ₂= V _ z =8 ~V The current through R₂ is aligned & I ₂= V ₂ R ₂ = 8 1600 =5 10⁻³ ~A & I ₂=5 ~mA aligned ...(i) The voltage drop across R₁ is aligned & V ₁=20- V ₂ & 20-8=12 ~V aligned The current through R₁ is I ₁= V ₁ R ₁ = 12 400 =3 10⁻² ~A =30 10⁻³ ~A I ₁=30 ~mA ...(ii) The current through the Zener diode is aligned I _ z & = I ₁- I ₂ & =(30-5) mA [ From (i) and (ii) ] & =25 ~mA aligned