Ammeter - an instrument used to measure the electric current passing through a circuit
Anion - a negative ion and is attracted to the anode
Anode - the electrode where oxidation occurs. The anode of an electrolytic cell is the electrode connected to the positive electrode of the d.c. supply. Electrons are withdrawn from the anode by the power sou
Cathode - the electrode where reduction occurs. The cathode of an electrolytic cell is the electrode connected to the negative electrode of the d.c. supply. Electrons flow from the power source to the cathode
Cation - a positive ion and is attracted to the cathode
Effluent - an outflowing of water after use and this water may contain heavy metals
Electrolysis - the chemical reaction that occurs when electricity passes through an electrolyte in molten state or in aqueous solution
Electrolyte - a substance which conducts electricity in molten state or in aqueous solution, and is decomposed by electricity during the conduction
Electrolytic cell - a cell in which electrolysis occurs
Electroplating - the coating of an object with a thin layer of a metal by electrolysis
Hoffman voltameter - an apparatus that can be used to carry out the electrolysis of acidified water
Preferential discharge - it occurs when an ion is discharged in preference to another on electrode in the electrolyte
Refining - the process of purification of a substance
Sodium amalgam - an alloy of sodium and mercury
Variable resistor - an instrument used to vary the resistance of the circuit and hence regulate the current