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Current Electricity

Current Electricity
The example of non-ohmic resistance is

Carbon resistance
tungsten wire
Copper wire
Aluminium wire

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Current Electricity
Current velocity through a copper conductor is

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

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Current Electricity
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is

Zero
About 2 ohms per degree
Positive
Negative

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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

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

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Current Electricity
A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

4.6 A, 6.9 A
4.6 A, 9.6 A
6.4 A, 9.6 A
6.4 A, 6.9 A

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Current Electricity
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

None of them
Either Rl or Ri
Ri
Rl

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