Question

The diode used in the circuit shown below has a constant voltage drop of $0.6V$ at all currents and a maximum power rating of $300milliwatt$. What should be the value of the resistance $R$, if maximum current passes through the diode?

• A. $4\Omega$
• B. $2\Omega$
• C. $1\Omega$
• D. $32\Omega$

Answer 1

The correct option is B $2\Omega$

Using, $P=IV$
$I=\frac{P}{V}$

$I=\frac{300\times {10}^{-3}}{0.6}=0.5A$

Using Kirchoff's law, /

$IR+0.6V=1.6V$

$IR=1V$

$R=\frac{1V}{0.5A}=2\Omega$