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Current Electricity
Question
A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature co-efficient of resistivity of silver.
Solution
Given,
Resitance of silver wire,
Room temperature, t1 = 27.5 °C
Resistance of wire at temperature 100o C, R2= 2.7
Using the relation,
where,
Therefore, temperature coefficient of resistivity of silver is given by,
Some More Questions From Current Electricity Chapter
What conclusion can you draw from the following observations on a resistor made of alloy manganin?
Current A
Voltage V
Current A
Voltage V
0.2
0.4
0.6
0.8
1.0
2.0
3.94
7.87
11.8
15.7
19.7
39.4
3.0
4.0
5.0
6.0
7.0
8.0
59.2
78.8
98.6
118.5
138.2
158.0
Current A
Voltage V
Current A
Voltage V
0.2
0.4
0.6
0.8
1.0
2.0
3.94
7.87
11.8
15.7
19.7
39.4
3.0
4.0
5.0
6.0
7.0
8.0
59.2
78.8
98.6
118.5
138.2
158.0
Answer the following questions:
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?
Answer the following questions:
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.
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Mock Test Series
Mock Test Series