FARADAY'S FIRST LAW
When an electric current is passed through an electrolyte, the amount of substance deposited is proportional to the quantity of electric charge passed through the electrolyte.
If W be the mass of the substance deposited by passing Q coulomb of charge, then according to the law, we have the relation:
W ∝Q
A coulomb is the quantity of charge when a current of one ampere is passed for one second. Thus, amount of charge in coulombs,
Q = current in amperes × time in seconds
= 1 × t
So W ∝1 × t
or W = z × 1 × t
where z is a constant, known as electro-chemical equivalent, and is characteristic of the substance deposited.
When a current of one ampere is passed for one second, i.e., one coulomb (Q = 1), then
W = Z
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