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Show that the semi conductor do not obey...

Show that the semi conductor do not obey Ohm's Law.

Text Solution

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1. Connect a circuit as shown in the figure

2. Close the circuit and the reading of ammeter (I) and voltmeter (V) in the following table.

3. Now connected two cells instead of one cell in circuit.
4. Now note the respectivie reading of ammeter and voltmeter.
5. Repeat the same for 3.4 and 5 cell.
6. Find the ratio of `(V)/(I)` every time.
7. We find that ratio is not constant.
8. Draw a graph between V and I. You get a graph as shown below.
9. This shown the semi conductors (LED is a semi conductor) do not obey Ohm's law.
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