Forward Bias Silicon Diode


1

CONTROLS

  Select Diode: VF
   DC volt :       Volt
   Resistance :   ohms

INSTRUCTION

  1. Connect the components as mentioned below:
    L1-L3, L4-L7, L8-L10, L5-L10, L6-L11,L9-L11, L9-L12.(For eg. click on 1 and then drag to 3 and so on.)
  2. Click on 'Check Connection' button to check the connections.
  3. If connected wrong, double click on the wrong connection. Else click on 'Delete all connection' button to erase all the connections.
  4. Select the diode (Click on the drop down "choose diode").
  5. Set DC voltage to 0.2 V .
  6. Set the resistor.
  7. Voltmeter is placed parallel to Silicon diode and ammeter series with resistor.
  8. The positive side of battery to the P side(anode) and the negative of battery to the N side(cathode) of the diode.
  9. Now vary the voltage upto 5V and note the Voltmeter and Ammeter reading for particular DC voltage .
  10. Take the readings and note Voltmeter reading across Silicon diode and Ammeter reading.
  11. Plot the V-I graph and observe the change.
  12. Calculate the dynamic resistance of the diode. rd=ΔV/ΔI
  13. 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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