The Electric Cell
- Current is the flow of particles in a particular direction. E.g air currents that cause winds or water currents.
- When particles flow in an electric circuit to produce electricity, it is called an electric current.
The flow of electric charges in a circuit is called an electric current. The direction is taken from the positive terminal to the negative terminal of the battery in an external circuit.
- A cell is a source of electric power, created inside by internal chemical reactions.
- When the chemicals inside the cell are exhausted, the cell needs to be replaced by a new one.
- Cells have two terminals: a positive and a negative terminal. In order for current to flow, the positive terminal must be connected to the negative terminal and this polarity must be maintained.
Bulb Connected to an Electric Cell
- An electric wire is a conducting path in an electric circuit, through which current flows.
- It is usually made out of a metal that is a good conductor of electricity.
Electric Bulb and its working
- Consists of a thin wire that glows due to the passage of current. This is known as the filament.
- An electric circuit provides a closed path for the current to flow. Terminals of the bulb are connected by wires to the electric cell.
- Sometimes the bulb does not glow as the filament gets fused (breaks) due to overheating.
An Electric Circuit
- A closed-loop path which the current takes is known as an electric circuit.
- When the path of the circuit is closed, current flows through it.
- When there is a break in the path (switch is open) then, the circuit is open and not conducting so the current does not flow.
An Electric Switch
- Devices that are used to connect the circuit or break it.
- When the switch is connected, we call it ON, and when it’s not in contact (or open) with the circuit, the switch is OFF.
Conductors and insulators
- Any material that allows the electric current to pass through it is called as the conductor. Eg: metals like copper
- Materials that do not allow the free flow of current through it are known as bad conductors or insulators E.g: Rubber, plastic
Learn more about the Electricity and Circuits from the topics given below: