Question

In ce transistor amplifier the audio signal voltage across the collector resistance of 2kohm is2v suppose the current amplificatiion of the transistor is100 find the input signal voltage and base current if base resistance is 1 ohm

Answer 1

base current is 0.01mA
and Vin = Rin × base current
Vin= 0.01 mV

Answer 2

Hey !!

Given, Rc = 2 kΩ = 2 × 10³  Ω

     Rb = 1 kΩ

      V₀ = 2V

Input voltage (Vi) = ?

     β = Ic / Ib = 100

 V₀ = IcRc = 2 V

Ic = 2 / Rc = 2 / 2 × 10³ Ω = 10⁻³ A = 1 mA

Base current

         Ib = Ic / β

= 10⁻³ / 100

          = 10 × 10⁻⁶ A = 10 μA

Base resistance

         Rb = Vbb / Ib

   Input voltage,

                        Vi = Rb / Ib

= 1 × 10³ × 10 × 10⁻⁶

         = 0.01 V

Good luck !!