What is Battery?

Origin of a Battery:

  • The first battery was built and described by an Italian physicist Alessandro Volta in 1800’s.
  • He named it as the voltaic pile; it was a stack of copper and zinc plates, separated by brine-soaked paper discs, which could produce a steady current for a considerable time.

Definition of a Battery: 

  • A battery is a device consisting of one or more electrochemical cells with external connections for powering electrical devices such as flashlights, mobile phones, radios,and many.

About Electrochemical Cell:

  • An electrochemical cell is a device capable of either generating electrical energy from chemical energy or using electrical energy to cause chemical reactions.
  • In simple terms, chemical energy is converted into electrical energy.

Terminals of a Battery

  • A battery has two terminals the positive terminal is the cathode and the negative terminal is the anode, got confused?
  • Okay I use this trick to remember the terminals, cat is positive, happiness so cathode is positive.

Working of a Battery:

  • The terminal marked negative which is termed as anode is the source of electrons . These electrons tend to get attracted to the positive terminal but they cannot , due to the lack of medium . So when we connect an external load to it they travel through the load.

    Example : A bulb

    Result : The bulb glows.

Categories of a Battery:

Batteries are divided into two categories
  1. Primary Batteries
  2. Secondary Batteries

Primary Battery:

  1. When we talk about primary batteries these are the one which we use in our tv remote, wall watches, small toys. Yes u got it these are the batteries that can’t be recharged once they are used.
  2. This means they are designed to be used until they are out of energy then discarded. Their chemical reactions are generally not reversible, so they cannot be charged. Once the supply of reactions in the battery is exhausted, the battery stops producing current and is useless.

Secondary Batteries:

  • These are the opposite of primary batteries. Which means they can be recharged; their chemical reactions can be reversed again by applying electric current after they are used These secondary Batteries are also called as secondary cells or rechargeable batteries. They can be recharged by a device called Charger.