20:- Solar Plant 
Aim :- to know about the solar.
Requirement :- solar panels.
Main source of solar energy is sun . We don’t require any of the electrical
Supply for it .and we don’t require any bill  for the solar .
We get energy produce from sun about 6 hours in a day and we can store it in .Battery
* 300 sq area 250 battery get charged on 12 panels .
* And for 300 sq  its about 1 lac rupees cost.
* 13-15 unit energy is generated.
* We can store energy by use of battery .
Assembly :- for solar circuit .we should cannot solar panels in series . Or in parallel as