Question

When the forward bias voltage in a semiconductor diode is changed from 0.8 V to 1.0 V, the forward current changes by 2.0 mA. The forward bias resistance of the diode will be ______.

Options

• 200 Ω

• 175 Ω

• 100 Ω

• 125 Ω

Answer 1

When the forward bias voltage in a semiconductor diode is changed from 0.8 V to 1.0 V, the forward current changes by 2.0 mA. The forward bias resistance of the diode will be 100 Ω.

Explanation:

Given: V₂ = 1.0

V₁ = 0.8

ΔI = 2.0 mA

= 2 × 10⁻³ A

Change in voltage

ΔV = V₂ − V₁

= 1.0 − 0.8

= 0.2 V

Dynamic (AC) resistance of a diode

r = `(ΔV)/(ΔI)`

= `0.2/(2 xx 10^-3)`

= `0.2/0.002`

= `200/2`

= 100 Ω