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Current Electricity

Current Electricity
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

0.4 ohm
0.6 ohm
1.0 ohm
0.8 ohm

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Current Electricity
Current velocity through a copper conductor is

of the order of a few ^.s/m
the same as propagation velocity of electric energy
independent of current strength
nearly 3 x 108 m/s

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Current Electricity
International ohm is defined in terms of the resistance of

A cube of carbon
A cube of copper
The unit length of wire
A column of mercury

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Current Electricity
The resistance of a straight conductor is independent of

Shape of cross-section
Temperature
Material
Cross-sectional area

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Current Electricity
Varistors are

Insulators
Carbon resistors
Non-linear resistors
Resistor with zero temperature co-efficient

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Current Electricity
The flow of current in solids is due to

Nucleus
Atoms
Electrons and ions
Electrons

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