Special Purpose Diodes
Consider the following statements:
A. The junction area of solar cell is made very narrow compared to a photo diode. B. Solar cells are not connected with any external bias.
C. LED is made of lightly doped p-n junction.
D. Increase of forward current results in continuous increase of LED light intensity. E. LEDs have to be connected in forward bias for emission of light.
Choose the correct answer from the options given below:
Show answer and solution
Answer: (b)
- A: false; a solar cell has a large junction area to collect more light.
- B: true; a solar cell generates its own emf, no external bias.
- C: false; an LED is heavily doped.
- D: false; intensity rises with current only up to a point, then falls.
- E: true; LEDs emit only under forward bias.
- So the answer is (b) B, E only.