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Class 12
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Current Electricity
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Ohm's Law
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Factors Affecting Resistance
Factors Affecting Resistance
7 Mins
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REVISE WITH CONCEPTS
Dependence of Resistance on Shape, Size,Resistivity and Temperature
Example
Definitions
Formulaes
QUICK SUMMARY WITH STORIES
Dependence of Resistance on Shape, Size and Resistivity
3 mins read
Resistance and Resistivity
2 mins read
Resistivity and Conductivity
3 mins read
Effect of Temperature on Resistance
2 mins read
Important Questions
A wire of length L and resistance R is stretched so that the length is doubled and area of cross section halved. How will (i) resistance change and (ii) resistivity change.
Medium
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On what factors does the resistance of a conductor depends ? Write SI unit of resistance
Easy
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(a) State Ohm's law.
(b) Describe an experiment to verify this law.
Easy
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>
State and explain Ohm's law.
Medium
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The voltage - current
$(V−I)$
graph of a metallic conductor at two different temperature
$T_{1}$
and
$T_{2}$
is shown below. At which temperature is the resistance higher?
Medium
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What length of copper wire of resistivity
$1.7×10_{−8}Ωm$
and radius 1 mm is required so that its resistance is
$1Ω$
?
Medium
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State Ohms law?
Medium
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When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become:-
Medium
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A given length of a wire is doubled on itself and this process is repeated once again. By what factor does the resistance of the wire change?
Medium
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Two wires of same material have lengths
$L$
and
$2L$
cross-sectional areas
$4A$
and
$A$
respectively. The ratio of their resistances would be
Medium
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>