Basic Concepts:
Before going in detail of various electroanalytical techniques, let's recapitulate some basic concepts that you have studied within your undergraduate classes.
Ampere (A): Ampere is the unit of current. That is so called in honour of the French Physicist and Chemist A.M. Ampere. It is reduced as 'A'. One ampere is equivalent to the unvarying direct current that while passed by a silver nitrate solution, under many exact conditions that will deposit silver at the rate of 0.00111800 g s-1.
Ohm (?): The unit of electrical resistance is known the Ohm in honour of the German physicist G.S. Ohm. The resistance offered through a uniform column of mercury 106.300 cm long and along with a mass of 14.4521 g within a direct current at 0o C is equivalent to one Ohm.
Volt (V): The unit of electromotive forces (emf) and potential difference are called the volt in honour of Italian physicist C.A. Volta. In the unit, volt is derived from the units of current and resistance via Ohm's law, thus, One volt is equal to the electromotive force which when applied to a conductor whose resistance is one Ohm will produce a current of one ampere.
Coulomb (C): The coulomb is the usual unit to express the quantity of electricity. The name has been given in honour of French physicist C.A. Coulomb. A single coulomb corresponds to a constant current of one ampere flowing for one second.
Faraday (F): The quantity of electricity associated with one equivalent of chemical change in an electrochemical process is called the Faraday. One Faraday is equal to 96494 coulombs. That is named in honour of M. Faraday who is an English Scientist.
Siemens (S): This is the unit of electric conductance. S = A/V