The energy stored in a simple cell is

Step 1: Analyze the question The question asks what form of energy is stored in a simple cell (for example, a copper and zinc plate in dilute sulphuric acid).

Step 2: Explain the concept A simple cell has two different metals (electrodes) dipped in an electrolyte. The energy is not stored as electricity. It is stored in the chemical substances inside the cell, namely the electrodes and the electrolyte.

Step 3: Walk through the solution

• In a simple cell with zinc and copper plates in dilute H₂SO₄, the zinc reacts chemically with the acid.
• Zinc atoms lose electrons and go into solution as Zn²⁺ ions. This is a chemical reaction.
• The released electrons flow through the external circuit, which is what we call electric current.
• So the chemical energy of the materials is converted into electrical energy when the cell is connected in a circuit.

Checking the options:

• A. Electrical: This is the energy the cell delivers, not what it stores.
• B. Nuclear: This is related to the nucleus of atoms and has nothing to do with cells.
• C. Thermal: Heat is not the stored form in a cell.
• D. Chemical: This is correct. The energy is stored in the chemicals and released by chemical reaction.

Step 4: Answer The energy stored in a simple cell is chemical energy, which is option D.

Exam tip: Remember the energy conversion chain for cells and batteries: Chemical → Electrical. Any time you see "cell" or "battery" in a question on stored energy, think chemical. Similarly, a dry cell and an accumulator store chemical energy too.