Question

In the diagram given ahead, which bulb out of $B_1$ and $B_2$ will glow and why ?

(b) Draw a diagram of an illumunated p-n junction solar cell.
(c) Explain briefly the three processes due to which generation of emf takes place in a solar cell.

Answer 1

(a) $B_1$ will glow because only diode $D_1$ is forward biased.
(b)

(c)Three process due to which generation of emf takes place in a solar cell are :
(1) Generation, (2) Separation, (3) Collection.
(1) Generation : Generation of electron-hole pairs take place due to light.
(2) Separation : Separation of electron-hole pairs are due to electric field of depletion region.
(3) Collection : Electrons reach the n-side and are collected in front contact and holes are collected in the back contact.