1. SCHEME OF VALUATION FORTHE PRACTICALEXAMINATION
The practical examinationwillbe fora durationof twohours maximummarksallottedistwentyand
wouldbe reducedtoten.
The scheme forallotmentof marksisas follows:
1. Relevantformulaand explanationof terms(If thereare twoformulaineach)
2. For electrical experimentscircuitdiagramandforotherexperiments briefexplanationof
experimental setup.
3. Brief procedure of the experiment.
4. Tabularcolumnof the experiment.
5. Observationandenteringthe readingintabularcolumn.
6. Substitutionandcalculations.
7. Resultwithunitaccuracy.
8. Practical record.
Total:20 marks
Experimentno.01
Lawsof Combinationof resistance.
AIM: Verificationof lawsof combinationof resistance usingohm’slaw.
APPARATUS: Battery,ammeter,voltmeter,standardresistancecoils,rheostatplugkeyand
connectingwires.
Verificationof lawof SeriesCombinationof resistance.
Formulae:1.Rs=V/I(experimental)
2.Rs=R1+R2(theoretical).
Where Rs=effective resistance of seriescombination.
V=P.dacross the combinationof resistance.
I=Currentthrough the combinationof resistance.
R1&Ro=givenresistance.
PROCEDURE:-
2. 1. The Circuitconnections are made asShowninthe circuitdiagram.
2. The rheostatisadjustedfora practical value of current,correspondingvoltage isnoted
downand V/Iiscalculated.
3. The experimentisrepeatedfordifferentvaluesof current.
4. The average value of V/Igivesexperimentalvalue of Rs.
5.It isfoundthat experimental value of Rsisnearlyequal totheoretical valueof Rs.
6. This verifiesthe lawof resistance inseriescombination.
B. Verificationof lawof parallel combinationof resistance:
Formula:1) Rp=V/I(experimental)
2)Rp=R1R2/R1+R2(Theoretical)
Where Rp=effective resistance of parallel combination.
V=P.dacross the combinationof resistances.
R1&R2=given resistances.
PROCEDURE:
1. The circuit connectionsare made asshowninthe circuit diagram.
2. The rheostatis adjustedfora particularvalue of currentcorrespondingvoltagevis
noteddownandv/I iscalculated..
3. The experimental isrepeatedfordifferentvaluesof currentI.
4. The average value of v/I givesexperimentalvalue of Rp.
5. It isfoundthat experimentalvalue of Rpismanyequal to theoretical valueof Rp.
6. This verifiesthe lawof resistance inParallel combination.
Observation:
R1=_ ohm. R2=_ ohm.
Tr. No I inA V inv Rs=V/Iinohm
1. 40 2 20
2 50
Result:A experimental va
