Basic Electrical Installation Work
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CHEMICAL EFFECT
When electric current flows through conducting liquid, the liquid is
separated into its chemical parts. Small pieces of
lodestone attached wooden splints floating bowl water always
came rest pointing north–south direction.
Iron, nickel and cobalt are the only elements which are attracted strongly
by magnet. The conductors which make contact with
the liquid are called the anode and cathode. was one the earliest industrial applications electric cur-
rent. Later, during the Middle Ages, navigational compasses
were made using the magnetic properties lodestone. Lines magnetic flux have physical existence, but they were
introduced Michael Faraday (1791–1867) way explaining
the magnetic energy existing space material.
An anode and cathode dissimilar metal placed electrolyte can
react chemically and produce emf.
. When load connected across
the anode and cathode, current drawn from this arrangement, which
is called cell.
Magnetism
The Greeks knew early 600 that certain form iron ore, now
known magnetite lodestone, had the property attracting small
pieces iron.
Some basic rules magnetism
1. Silver and nickel plating has long
been used enhance the appearance cutlery, candlesticks and sporting
trophies. They help us
to visualize and explain the magnetic effects.
Electrolysis industrial process used the refining metals and elec-
troplating. These materials are said ferromagnetic. The symbol used for
magnetic flux the Greek letter (phi) and the unit magnetic
flux the weber (symbol Wb), pronounced ‘veber’, commemorate
the work the German physicist Wilhelm Weber (1804–1891).
2. Lines magnetic flux always form closed loops. The word lodestone is
derived from old English word meaning ‘the way’, and the word mag-
netism derived from Magnesia, the place where magnetic ore was first
discovered. has many use-
ful applications providing portable electrical power, but electrochemical
action can also undesirable since the basis electrochemical cor-
rosion which rots our motor cars, industrial containers and bridges. Electroplating serves double purpose pro-
tecting base metal from atmospheric erosion and also giving more
expensive and attractive appearance. battery made number cells. Copper, brass,
wood, PVC and glass are not attracted magnet and are, therefore,
described non-magnetic. The liquid itself called the
electrolyte, and the process called electrolysis. Most the aluminium produced today extracted from its ore by
electrochemical methods
