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Current Electricity

Current Electricity
The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

0.5
1.5
0.6
1

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Current Electricity
Current velocity through a copper conductor is

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

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Current Electricity
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will

Decreases
Remains same
Heater will burn out
Increases

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Current Electricity
The insulation on a current carrying conductor is provided

To prevent leakage of current
Both of the listed here
To prevent shock
None of above factors

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Current Electricity
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

20 W
60 W
10 W
40 W

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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

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

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