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Electrode Potential

A diode made ...

Question

A diode made of silicon has a barrier potential of $0.7 V$ and a current of $20 m A$ passes through the diode when a battery of emf $3 V$ and a resistor is connected to it. The power dissipated across the resistor and diode are

0.046 W, 0.014 W

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4.6 W, 0.14 W

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0.46 W, 0.14 W

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46 W, 14 W

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Solution

The correct option is A $0.046 W, 0.014 W$
Given that:
$V_{D} = 0.7 V$
$I = 20 m A = 0.02 A$
$V_{B} = 3 V$

Now, $P = (V_{B} - V_{D}) I$
or $P = (3 - 0.7) 0.02 = 0.046 W$

And power across $R_{D}$ is
$P_{R_{D}} = (V_{D}) I$
$P_{R_{D}} = 0.7 \times 0.02 = 0.014 W$

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