Non Ohmic Device

V

A

R

VDC

CONTROLS

   DC volt :       Volt
   Resistance :   Kohms

INSTRUCTION

  1. Set DC voltage to 5 V .
  2. Use the resistor of 100K ohms and a diode.
  3. Voltmeter is placed parallel to Silicon diode and ammeter series with resistor.
  4. Now note the Voltmeter and Ammeter reading for DC voltage 5V.
  5. Decrease the Resistance as 75K, 51K, 24K and 10K Ohms and take the readings and note Voltmeter reading across Silicon diode and Ammeter reading.
  6. Plot the V-I graph and observe the change.
  7. The Change is not simply proportional. V versus I graph is not a straight line.
  8. Therefore from the graph we see that the diode does not adhere to Ohms law.Thus diode is said to be non-Ohmic device.

EXPERIMENTAL TABLE

Serial No. Voltage(Volt) Current
(mAmp)		 Resistance
(KOhm)

GRAPH PLOT

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