Electric Cell
Key Notes :
1. What is an Electric Cell?
- An electric cell is a device that converts chemical energy into electrical energy.
- It consists of two electrodes (a positive and a negative) and an electrolyte, which helps in the flow of current.
2. Parts of an Electric Cell:
- Electrodes: Two metal plates, usually made of zinc (negative electrode) and copper (positive electrode).
- Electrolyte: A substance that allows the flow of electrical charge, typically a solution like sulfuric acid or a salt solution.
- Container: Holds the electrolyte and electrodes together.
- Terminals: The two terminals (positive and negative) allow the electric current to flow in a circuit.
3. How an Electric Cell Works:
- The chemical reaction between the electrolyte and electrodes produces electrical energy.
- Electrons flow from the negative electrode to the positive electrode through an external circuit, creating an electric current.
4. Types of Electric Cells:
- Primary Cells: Cannot be recharged. Examples include dry cells used in flashlights and batteries in toys.
- Secondary Cells: Can be recharged and reused. Examples include rechargeable batteries like those in mobile phones.
5. Uses of Electric Cells:
- Power small electronic devices like torches, remote controls, and clocks.
- Used in batteries to store and supply energy.
6. Simple Electric Circuit:
- An electric cell can be used to make a simple electric circuit by connecting it to a light bulb or another device through wires.
- The cell provides the necessary energy for the flow of current.
7. Voltage and Current:
- The voltage of a cell is the potential difference between the positive and negative terminals.
- The current is the flow of electrons through the circuit.
8. Example of an Electric Cell:
- Dry Cell: Commonly used in everyday devices. It contains a zinc shell and a carbon rod, with an electrolyte paste inside.
Let’s practice!
