Dry cell E.M.F Value is approximately _______.

The correct option is 4

Concept:

Dry cell (Zinc-Carbon):

• A dry cell has the electrolyte immobilized as a paste, with only enough moisture in it to allow current to flow. Unlike a wet cell, a dry cell can operate in any orientation without spilling, as it contains no free liquid. This versatility makes it suitable for portable equipment.
• A dry cell consists of a metal container in which a low-moisture electrolyte paste covers the graphite rod or a metal electrode. Generally, the metal container will be zinc whose base acts as a negative electrode (anode) and a carbon road acts as a positive electrode (cathode). It is surrounded by manganese dioxide and low moisture electrolytes like ammonium chloride paste, which will produce a maximum of 1.5V of voltage, and they are not reversible.
• These are popular batteries used nowadays on laptops, iPods, and cellphones.
• The electrodes of the cell are made up of lightweight carbon and lithium. They are low-maintenance batteries and no memory is required to enhance battery life. They are less harmful even after disposing and self-discharge is less than half of the NiCd cell.
• A common dry cell is a zinc-carbon cell, sometimes called the dry Leclanché cell, with a nominal voltage of 1.5 volts, the same as the alkaline cell (since both use the same zinc–manganese dioxide combination).