One word
Q- A device used
to break a circuit?
A- Fuse
Q- Drawing more current through a circuit?
A- Overloading
Q- Name the scientist
who first discovered the magnetic effect of electric circuit?
A- Hans Christian Oersted
Q- Name the scientist who invented electric bulb for lightening
purpose?
A- Thomas Alva Edison
Q- Modification of fluorescent tubes which emit still
morelight with less consumption of electric energy?
A- CFLs
Q- Mention the name of some appliances which we make use
of heating effect of electricity
A- Iron, electric
kettle, geyser, room heater, micro oven.
Q- Devise used to open or close a circuit?
A- Switch
Q- A material which allow electric current to pass
through it?
A- Conductor
Q- A material which does not electric current to
pass through it?
A- Non conductor
Q- Coating of a conductor with non conductor of
electricity?
A- Insulation
Q- A metallic wire coated with insulating material and
use for conduction of electricity?
A- Cable
Q- Why electromagnets are called temporary magnets?
A- They are magnets only until electric current is
passing through its coil. As current is switched off the electromagnet loses
its magnetic property.
Q- Mention the uses of magnets and electromagnets
- Magnets are used in toys.
- Doctor to take out small particles of magnetic metal like iron, nickel etc, which may have fallen in eye, uses electromagnets.
- Electromagnets are used in electric fans, electric trains, electric motors etc.
- Electromagnets are used in radio, TVs, mobile etc.
- It is used in electric bell.
Q- Mention precautions
while experimenting with electricity?
- Never touch a light bulb with bare hands.
- Do not touch appliances when its ON it may cause fire.
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