Forward Bias – Germanium Diode

V

A

R

VDC

CONTROLS

   DC volt :       Volt
   Resistance :   Kohms

INSTRUCTION

  1. Set DC voltage to 0.2 V .
  2. Use the resistor of 1K ohms and a Germanium diode.
  3. Voltmeter is placed parallel to Germanium diode and ammeter series with resistor.
  4. The positive side of battery to the P side(anode) and the negative of battery to the N side(cathode) of the diode.
  5. Now vary the voltage upto 30V and note the Voltmeter and Ammeter reading for particular DC voltage .
  6. Take the readings and note Voltmeter reading across Germanium diode and Ammeter reading.
  7. Plot the V-I graph and observe the change.
  8. Therefore from the graph we see that the diode starts conducting when the forward bias voltage exceeds around 0.3 volts (for Ge diode). This voltage is called cut-in voltage.

EXPERIMENTAL TABLE

Serial No. Forward Voltage(Volt) Forward Current(mAmp)

GRAPH PLOT

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