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3. Using Ohm’s law, find the value of each resistance. Let it be R1 and R,2.
4. Connect the two given resistors in series combination across the terminals of
voltmeter as shown in figure above.
5. Put the plug in the key and take the readings of ammeter and voltmeter.
6. Repeat step 5 three times by changing the position of the sliding contact of the
rheostat.
7. Tabulate the readings and find the ratio of V and I for the series combination. It
will give the equivalent resistance of the combination.

OBSERVATION TABLE

OBSERVATIONS

1. Least count of ammeter = …………. A
2. Zero error of ammeter =…………. A
3. Least count of voltmeter=…………. V
4. Zero error of voltmeter = ………….V
5. Zero correction in ammeter reading = A
6. Zero correction in voltmeter reading = V

CALCULATIONS

1. Mean value of R1 = ……………Ω
2. Mean value of R2 = ……………Ω

Equivalent value of series combination

1. by calculation R’s = R1 + R0 =……………Ω.
2. by experiment, R. =……………Ω
Difference in both values = R s-R’s =……………Ω

RESULT

1. There is a close agreement between the calculated and the experimental
values of equivalent resistance. Hence, Rs = R1 + R2 is verified.