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

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46 W

46 mW

14 W

66 mW

answer is D.

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Detailed Solution

Potential drop across the resistance is 4-0.7=3.3 V Power consumption across the resistance is VI=3.3×20×10-3=66 mW

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