# What conclusion can you draw from the following observations on a resistor made of alloy manganin? - Physics

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

 CurrentA VoltageV CurrentA VoltageV 0.2 3.94 3.0 59.2 0.4 7.87 4.0 78.8 0.6 11.8 5.0 98.6 0.8 15.7 6.0 118.5 1.0 19.7 7.0 138.2 2.0 39.4 8.0 158.0

#### Solution

It can be inferred from the given table that the ratio of voltage with current is a constant, which is equal to 19.7. Hence, manganin is an ohmic conductor i.e., the alloy obeys Ohm’s law. According to Ohm’s law, the ratio of voltage with current is the resistance of the conductor. Hence, the resistance of manganin is 19.7 Ω.

Concept: Resistivity of Various Materials
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#### APPEARS IN

NCERT Physics Part 1 and 2 Class 12
Chapter 3 Current Electricity
Exercise | Q 3.17 | Page 129
NCERT Class 12 Physics Textbook
Chapter 3 Current Electricity
Exercise | Q 17 | Page 129

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