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A diode made of silicon has a barrier po...

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 `emf` ` 3 V` and a resistor is connected to it. The wattage of the resistor and diode are

A

`0.46W, 0.01W`

B

`4.6W, 0.14W`

C

`0.46W, 0.14W`

D

`46W, 14W`

Text Solution

Verified by Experts

The correct Answer is:
A
P=VI (for resistor)
`=(3-0.7)20xx10^(-3)=2.3xx20xx10^(-3)`
`=465xx10^(-3)=0.046W`
for diode, `P=0.7xx20xx10^(-3)=0.014W`
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