question_answer 17)

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

Current	Voltage	Current	Voltage
A	V	A	V
0.2	3.94	3.0	59.2
0.4	78.7	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

 

Answer:

It indicates that Ohm's law i.e.  is valid for a wide range.                 Resistivity of Manganin remains nearly same with change in temperature.