A cell converts:
(A) electrical energy into chemical energy
(B) chemical energy into electrical energy
(C) magnetic energy into electrical energy
(D) electrical energy into mechanical energy

Hint: Keep in mind that in a cell the chemical changes will produce the electricity. A series of redox reactions takes place inside the cell and the electron transfer takes place simultaneously. Cells provide a portable form of electrical energy.

Complete step by step answer:
- The knowledge of cells is very important to understand the processes happening inside a cell. A cell is a device which converts chemical energy to electrical energy. It consists of two solid electrodes and this solid electrodes are placed in an electrolyte and connected together by an electrical conductor such as wire.
-The two electrodes should be made up of two different metals and the electrolyte solution can be an alkaline, acidic or salt solution depending on the situation.
- These electrodes can be depicted as two half cells set up in different containers and are connected through a porous or salt solution.
-The more electropositive metal among the electrodes undergo oxidation and is termed as anode. The less reactive metal among them has a low tendency to lose electrons and thus it undergoes reduction and the electrode is termed as cathode.
- As we mentioned oxidation takes place at anode and hence they supply the electrons and this electrons move from the anode to cathode through the external circuit thus generating the electricity.
-The redox reaction is responsible for the conversion of chemical energy into electrical energy and this reactions are spontaneous.
 From the above discussions it’s clear that a cell converts chemical energy into electrical energy.
So, the correct answer is “Option B”.

Note: It should be noted that the voltage produced by a cell will depend on the positions of the two metals (electrodes) in the reactivity series. The larger will be the voltage if the metals in the reactivity series are further away. The metal which is higher up in the metals reactivity series will be preferentially oxidized and it will become anode whereas the metal lower down in the metals reactivity series will become the cathode.