(1) explain the term : 'heating effect of electric current '.
(2) drive an expression for the heat produced by electric current and state joules law.
(3) explain why an inert gas like Argon is filled in bulbs.
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the answer of first question is when electric current passes into conductor, the conductor became hot and produce heat energy and also light energy
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answer of third is the bulb shine more and more
and answer second
joules law mean when heat is produced in a Electrik wire by flow of Electrik current
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1) HEATING EFFECTS OF ELECTRIC CURRENT:-
When an electric current is passed through a high resistance wire like nichrome , the resistance wire becomes very hot and produces heat. This is called heating effects of elecric current.
2) P = V×Q/T
P =VI
E = P×t
VI×t = VIt
E = IRIt [ V = IR ; Ohm's law]
= I(square)Rt
JOULE'S LAW:- When current of I ampere flows in a wire of resistance R ohm for t seconds, the heat energy dissipated by it is given by H=I(square)Rt.
3) The bulbs are usually filled with chemically inactive nitrogen and argon gas so that filament doesn't burn out and the life of filament is prolonged
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