Question

Photovoltaic cells need an external electrical supply to function.

(a) True

(b) False

I have been asked this question in an online interview.

I need to ask this question from Photoelectric Transducers topic in portion Physiological Transducers of Biomedical Instrumentation

Answer 1

Right choice is (b) False

To explain: Photovoltaic cells are very robust in construction, need no external electrical supply and produce a photocurrent sometimes stronger than other photosensitive elements. Typical photocurrents produced by these cells are as high as 120 mA/lumen. At constant temperature, the current set up in the cell usually shows a linear relationship with the incident light intensity.