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Q.

A diode made of silicon has a barrier potential of 0.7V and a currrent of 20mA passes through the diode when a battery of emf 3V and a resistor is connected to it. The wattage of the resistor and diode are

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a

0.046W, 0.014W

b

4.6W, 0.14W

c

0.46W, 0.14W

d

46W, 14W

answer is A.

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Detailed Solution

P = VI (for resistor)=(3−0.7)20×10−3=2.3×20×10−3=46×10−3=0.046Wfor diode, P=0.7×20×10−3=0.014W
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