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Current Electricity

Current Electricity
Electric current is a

Vector quantity
Number only
Sometimes scalar and sometimes vector
Scalar quantity

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Current Electricity
If an electric current is passed through a nerve, the man

Begins to weep
Begins to laugh
Is excited
Becomes insensitive to pain

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Current Electricity
Electric pressure is also called

Voltage
Resistance
Energy
Power

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

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Current Electricity
An electrical lamp coonsumes 100 W of power. If the supply voltage is 220 V the energy consumed in 30 minutes is

0.005 kWh
5 kWh
5 kWh
0.05 kWh

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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
of the order of a few ^.s/m
independent of current strength

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