First slide

P-N junction diode

Question

A diode made of Silicon has a barrier potential of 0.7 V and a current of 20 mA passes through the diode, when a battery of 4 V and a resistance R are in series to it. The wattage of the resistor is

Difficult

A

46 W
B

46 mW
C

14 W
D

66 mW

Solution

Potential drop across the resistance is $4 - 0.7 = 3.3 V$
Power consumption across the resistance is $VI = 3.3 \times 20 \times 10^{- 3} = 66 mW$

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