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Magnetic Effects of Current-2
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When a fuse is rated at 8 A, it means
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it will not work if current is less is less than 8 A
it has resistance of 8 ohm
it will work only if current is 8 A
it will burn if current exceeds 8 A
The use of fuses in electric power-line is
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to keep main voltage constant
to open the line permanently when there is an overload
just to show an indication when there is an overload
as a switch to use in an emergency
Dynamos and motors are based on
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Faraday's law
Ampere's force law
Faraday's law and Ampere's law respectively
Ampere's force law and Faraday's law respectively
The direction of force of a current carrying conductor in a magnetic field is given by
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Fleming's left Hand rule
Fleming's right hand rule
Right hand thumb rule
left hand thumb rule
From a power station, the power is transmitted at a very high voltage because
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it is generated only at high voltage
it is cheaper to produce electricity at high voltage
electricity at high voltage is less dangerous
there is less loss of energy in transmission at high voltage
The magnetic field directed in the north direction acts on an electron moving in east direction the magnetic force on the electron will act
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vertically upward
towards the east
vertically downward
towards north
When the main switch of the house circuit is put off, it disconnects the
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live wire
neutral wire
earth wire
live and neutral wire
Potential difference between a live wire and neutral wire is
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150 V
210 V
200 V
220 V
According to new international convention of colour coding of wires used in house hold electrical
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live is red, neutral is black, earth is green
live is red, neutral is green, earth is black
live is brown, neutral is blue, and earth is black
live is brown, neutral is light blue, and earth is green
A device for producing electric current is called
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galvanometer
ammeter
generator
voltmeter
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