Forward Bias Silicon Diode

V

A

R

VDC

CONTROLS

  Select Diode: VF
   DC volt :       Volt
   Resistance :   ohms

INSTRUCTION

  1. Set DC voltage to 0.2 V .
  2. Select the diode.
  3. Set the resistor.
  4. Voltmeter is placed parallel to Silicon diode and ammeter series with resistor.
  5. The positive side of battery to the P side(anode) and the negative of battery to the N side(cathode) of the diode.
  6. Now vary the voltage upto 5V and note the Voltmeter and Ammeter reading for particular DC voltage .
  7. Take the readings and note Voltmeter reading across Silicon diode and Ammeter reading.
  8. Plot the V-I graph and observe the change.
  9. Calculate the dynamic resistance of the diode. rd=ΔV/ΔI
  10. Therefore from the graph we see that the diode starts conducting when the forward bias voltage exceeds around 0.6 volts (for Si diode). This voltage is called cut-in voltage.

EXPERIMENTAL TABLE

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

GRAPH PLOT

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