Date 25/03/2022
Multimeter is a device used to measure all electricity parameters.
Objective:-
1)To measure the voltage generate from solar module.
2)To calculate voltage required to solar dome light.
3) Use of resister in voltage reducing.
Date 25/03/22
first we took a solar module and it is put in the sunlight.The solar module was charged due to exposure to the sun.then we measured the voltage of the solar module with multimeter.i.e 10.8 V (3w,10v , parallel connection of solar module)
we connected the solar dome light to the variable power supply.we check the voltage required to dome light bulb i.e 6v approximately.
Date 26/03/22
The voltage generate from module was 10.8 v and dome bulb requires 6v.we don’t know how We reduce voltage from solar module.but after internet information we know the resister is useful for voltage reducing.after that we learn resister codes and values.ex..1k,2k,10k etc.
1k=1000 ohm
after we joint the voltage devider circuit
R1=10 k R2 = 10k Vin=10.8 v Vout=,?
Vout=Vin×[R2/R1+R2]=10.8×[10/10+10]=5v
But our bulb not operate at 5v additional 1v is required.
we calculate R1=10 k R2= 16 k but 16k resister is not available in our fablab.we take decision to connecting resister in series.for obtaining 16 k.we take R2=9.7k+4.6k+2.2k=16.5k and R1=9.7k
After conduct this trial we got 7.05 volt.but our requirement not fulfill.next trial we take R1=9.7k+2.1k=11.84 R2=9.7k+2.1k+4.6k=16.44k after conduct this trial we will get 6.5 v
Date 5/04/22
Operating exaust fan with solar module
Date 7/4/22
I took the three solar dome bulb and take three voltage regulators also took three jumble wires and attach them through soldering.
Date 8/4/22
I took the another two solar dome bulb and take two voltage regulators also took two jumble wires and attach them through soldering.
Date 9/4/22
I took another two dome bulbs and soldering them.
Date 15/04/22
I calculate the cost of materials required for operating dome bulb.
| Marerial | Quantity | cost | cost/unit |
| 3 w solar module | 2 | 25RS/watt | 150 Rs |
| Voltage regulator | 1 | 10 Rs | 10 Rs |
| Wire | 8 mtr | 14 RS/mtr | 112 Rs |
| Total | 272 Rs |
Date 20/04/22
The one customer in pabal village come to the vigyan ashram having their problem is darkness room is available in their house and electricity bills coming more because of operating bulb in day.
Date 21/04/22
The customer in pabal village contacting to vigyan ashram for installing dome bulb in their house.we going to that customers house and install the dome bulb in their house.The peoples in their house so happy for the reason of saving cost of the energy in the day.
Date 22/04/22
I going to the customers house for getting feedback. The customer demand was to more light from this bulb.
Conclusion:- I suggest greater voltage regulator from 6v for more light.
