A diode made by silicon has a barrier potential of 0.7 volts and current of 20mA passes through the diode when a battery of 3 volts and a resistance of R are in series to it, then the wattage of the resistor is .......
a)46 W
b)46 mW
c) 14 W
d)14 mW
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3 Answers
1is it (b) not sure thgh...please confirm.....
may be i'm rong but still confirm ...[1]
1since barrier is 0.7 volts so 0.7 volts frm the battery will be required by the diode to overcome the barrier and start conducting hence useful voltage is 3 - 0.7 = 2.3 V
now we know P = V.I so
→ P = 2.3 x 20 x 10-3 W = 46 x 10-3 W = 46 mW [1]