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Current Electricity

Current Electricity
Ohm's law is not applicable to

Small resistors
Semi-conductors
Dc circuits
High currents

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Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.8 x 10-8 ω-m
1.2 x 10-8 ω-m
1.4 x 10-8 ω-m
1.6 x 10-8 ω-m

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Current Electricity
The maximum current rating for a 10 kΩ, 0.5 W resistor is

14.14 mA
7.07 mA
0.707 mA
28.28 mA

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Current Electricity
Specific resistance of a substance is measured in

Ω-m
Ω/m
None of the listed here
m/Ω

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Current Electricity
One Newton meter is same as

One watt
One joule
Five joules
One joule second

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Current Electricity
If the number of valence electrons of an atoms is less than 4,the substance is usually

A conductor
None of the listed here
An insulator
A semiconductor

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MORE MCQ ON Current Electricity

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