An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :

Answer: Option B

A Galvanic cell, also known as battery, is an electrochemical cell that derives electrical energy from spontaneous redox reactions taking place within the cell. It is typically used as a source of electrical power. By their nature, they produce direct current. A battery is a set of galvanic cells that are connected in parallel.