A battery is an electrochemical device that stores energy in the form of chemical energy and gives out electrical energy. The battery has a positive terminal and a negative terminal and electrolyte is the chemical solution which surrounds the anode and the cathode. The current starts flowing in the battery when the positive terminal and negative terminal are connected.
These batteries are of different types. An example of a primary battery is the dry cell. In a dry cell, a zinc container is used as the anode and a carbon rod is used as the cathode. The space around the cathode is surrounded by manganese dioxide and cathode. The space between the container and the rod is filled with a moist paste of ammonium chloride and zinc chloride.
The electrode, usually metal is the electrical conductor used as a positive or negative terminal of an electrically conducting medium. The electrodes conduct the current into the medium and out of the medium. The medium is either solid, gas, vacuum or an electrolytic solution, as in a storage battery.
Positive and Negative terminals
The electrode from which the electrons emerge is the negative terminal. It is also called the cathode. The electrode that receives electrons is the positive terminal. It is called the anode.
Cathode or Negative Terminal
- The cathode is the negatively charged electrode
- It attracts the positive charge or cations
- The cathode is the source of the electrons
- Cathode generates the electrons, which is doing the actual movement in a circuit and produces current. Therefore, we can say that cathode produces the charge or that current moves from the cathode to the anode. Though the conventional direction of current is defined by the way a positive charge would move.
Anode or Positive Terminal
- The anode is the positively charged electrode.
- It attracts the electrons or anions