Question

Why care should be taken so that high reverse voltages do not appear across LEDs?

• A. None of these
• B. LEDs may burn.
• C. LEDs work at high reverse voltage.
• D. LEDs work at high forward voltage.

Answer 1

The correct option is B LEDs may burn.

The $\text{VI}$ characteristics of a LED is similar to that of a $\text{Si}$ junction diode.

But the threshold voltages are much higher and slightly different for each colour.

The reverse breakdown voltages of LEDs are very low, typically around $5\text{V}$.

So care should be taken that high reverse voltages do not appear across them as it may burn the LEDs.

Hence, option $\left(C\right)$ is the correct answer.