Faraday's First laws of electrolysis:

According to the first law, a mass of a substance liberated at the electrodes during electrolysis is straightly proportional to the quantity of electrical charge (Q) which passed through the electrolyte.

If m is the mass of a substance deposited through a current of I amperes in t seconds, after that according to the first law of electrolysis

m ∝  Q or  m  ∝   I ×  t

or  m  = ZIt

while, Z is the proportionally constant.

Therefore, the first law associates the quantity of current passed and the extent of chemical change which took place.