________________
other by porus separatoras made of rubber, plastic or glass fibre. This arrangement of positive and negative plates is placed inside the dilute sulphuric acid and connected to the lead terminals provided on the hard and rigid cover of the container [Fig.).
A
TU
Pbo
VIIIlIIlIlIIIIIII I TITTITTTTTTTTTI,
IIIIIIIIIIII11111
І МИТИНУИТЕЛИТУТУУ і
11111111111111111
HAWN MINT
IIIIIIIIIIIIIIIII!!
LIIIIIIIIIIIIIIIII
TUTTI IIIIIIIIII
DIL H, S,
VAT
RUBBER CONTACT
The e.m.f. of each cell of a fully charged lead accumulator is 2.05 V and a lead accumulator of each six cells produces and e.m.f. of nerarly 12 V. The specific gravity of the electrolyte (dilute sulphuric acid) is a fully charged lead accumulator is 1.28. However, when discharged, both the e.m.f. of the cell and the specific gravity of the electrolyte fall. Whereas, e.m.f. of a cell of the accumulator should not be allowed to fall below 1.8 V, the specific gravity of the elctrolyte should not
drop below 1.12.” 26. Satish K. Gupta. op. cit. pp. 1092, 1093.
“Photoelectric Cells A photoelectric cell is an arrangment which converts light energy into electrical energy. Photoelectric cells are of following three types : 1. Photoemissive cells, 2. Photovoltaic cells, 3. Photoconductive cells. 2. A photoemissive cells may be of vacuum type or gas filled type.
Let us discuss the working of a photoemissive cell. Photoemissive cell. It consists of two electrodes, a cathode C and an anode A enclosed in a highly evacuated glass bulb. The cathode Cis a semi-cylindrical plate coated with a photosensitive material, such as a
layer of cesium deposited on silver oxide. The anode A is in the form 70 D
-
Set 451 310 124
Jain Education International
For Private & Personal Use Only
www.jainelibrary.org
