The V-I characteristic of a silicon diode is as shown in the figure. Calculate the resistance of the diode at
(i) I = 5 mA and
(ii) V = -20V.
OR
Assuming that, the two diodes D1 and D2 are used in the electric circuit shown in the figure are ideal. Find out the value of the current flowing through 1ohm resistor.

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Detailed Solution

$(i) From the given curve, we have Voltage, V = 0.5 V for current of 10 mA Co, for 5 mA, V = \frac{0.5}{10} \times 5 = 0.25 V ∴ Resistance, R = \frac{V}{I} = \frac{0.25}{5 \times 10^{- 3}} = 50 Ω (ii) For V = - 20 V, we have I = - 1 μA = - 1 \times 10^{- 6} A \Rightarrow R = \frac{20}{1 \times 10^{- 6}} = 20 \times 10^{7} Ω$

$R_{EF} = 2 + 1 = 3 Ω I_{EF} = \frac{V}{R_{EF}} = \frac{6}{3} = 2 A$

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