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Class 12
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Current Electricity
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Ohm's Law
Ohm's Law
Revise with Concepts
Ohm's Law, Resistance and Resistivity
Example
Definitions
Formulaes
Dependence of Resistance on Shape, Size,Resistivity and Temperature
Example
Definitions
Formulaes
Learn with Videos
Ohm's Law
7 mins
Current in Resistor for varying cross-section area
7 mins
Simple Problems Based on Ohm's Law
7 mins
Resistance and Resistivity
9 mins
Factors Affecting Resistance
6 mins
Factors Affecting Resistance
7 mins
Quick Summary With Stories
Ohm's Law
3 mins read
Ohm's Law, Resistance and Resistivity
3 mins read
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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What length of copper wire of resistivity
1
.
7
×
1
0
−
8
Ω
m
and radius 1 mm is required so that its resistance is
1
Ω
?
Medium
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>
State Ohms law?
Medium
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>
State and explain Ohm's law.
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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>
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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State Ohm's law. Draw a graph between voltage and current for a metallic conductor. Draw a circuit diagram of a circuit which consists of battery, ammeter, voltmeter, resistor, rheostat and a key.
Medium
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State Ohms law. Write the necessary conditions for its validity. How is this law verified experimentally? What will be the nature of graph between potential difference and current for a conductor? Name the physical quantity that can be obtained from this graph.
Medium
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>