Saved Bookmarks
| 1. |
In a class room, a teacher was teaching about batteries in the chapter of 'electrochemistry' to 12th class. As the use of batteries is very common now a days for invertors and cellphones, students were very curious to know which battery they should use for their invertors at home and for their cellphones as a number of cheap as well as costly batteries are available in the market. the teacher advised them that they should use those batteries which do not cause any pollution or health hazard though these may be a little constlier. thus, he suggested the use of cadmium battery in place of lead storage battery for invertor and lithium ion battery in place of Ni-Cd battery low celphone. After reading the above paragraph, answer the followng questions: (i) What values are expressed by the teacher? (ii) How is lead storage battery harmful in the long run? (iii) How is Ni-Cd battery harmful? What are other advantages of using Li-Ion battery over Ni-Cd battery? |
|
Answer» Solution :(i) The teacher has expressed concern that we should not use those materials which cause health hazard or pollution in the ATMOSPHERE. (ii) Lead is poisonous. It has harmful effects on health as well as environment. (iii). Cd is TOXIC heavy metal and requires special care for disposal. other adavantages of Li-ion battery are: (a) It has a voltage of 3.6-3.7V whereas Ni-Cd battery has 1.2 V (B) It does not need periodic discharge whereas Ni-Cd battery is charged only after it is fully discharged. (C) Li-ion batteries do not LOSE their charge even after months of storage whereas Ni-Cd batteries lose 1-5% of their charge per day. |
|