State the meaning of the terms:
(a) Electro-magnetic induction
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(c) Electrodes
(b) Electrolysis 24-6
(d) Electrorefining of metals
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Answers
Answer:
a)The term electromagnetic induction means inducing electricity by magnetism.
The process by which a changing magnetic field in a conductor induces current in another conductor is called as electromagnetic induction.
The value of current induced in a circuit depends on the rate of change of magnetic flux linked with the closed circuit.
c)An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air). The word was coined by William Whewell at the request of the scientist Michael Faraday from two Greek words: elektron, meaning amber (from which the word electricity is derived), and hodos, a way.
b)In chemistry and manufacturing, electrolysis is a technique that uses a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell. The voltage that is needed for electrolysis to occur is called the decomposition potential.
d)Electrorefining of metals
Electrorefining is a process in which materials, usually metals, are purified by means of an electrolytic cell. The anode is the impure metal and the cathode is a very pure sample of the metal
An electric current is passed between a sample of the impure metal and a cathode when both are immersed in a solution containing cations of the metal. The metal is stripped off the impure components and deposited in pure form on the cathode
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