A Bulb Connected to an Electric Cell

Key Notes :

Electric Cell:

• An electric cell is a device that provides energy to move charges through a circuit.
• It has two terminals: positive (+) and negative (-).
• Examples include dry cells, batteries, and button cells.

Electric Bulb:

• An electric bulb produces light when electricity passes through it.
• Key parts of a bulb:
  • Glass bulb: Encloses the filament.
  • Filament: A thin wire that glows when heated by electric current.
  • Base: Connects to the holder and ensures contact with the circuit.

Connecting the Bulb to an Electric Cell:

• A wire is used to connect the bulb’s terminals to the cell’s terminals.
• Correct connection ensures the current flows through the circuit, lighting the bulb.

Closed and Open Circuits:

• Closed Circuit: When the circuit is complete, allowing current to flow, the bulb lights up.
• Open Circuit: If there’s a break in the circuit, current doesn’t flow, and the bulb doesn’t light.

Polarity:

• The bulb lights only when the positive terminal of the cell is connected to one terminal of the bulb and the negative terminal to the other.
• Incorrect connections may prevent the bulb from lighting.

Safety Precautions:

• Ensure connections are tight to prevent loose circuits.
• Use wires with proper insulation.
• Avoid touching bare wires to prevent electric shock.

Practical Observations:

• If the bulb does not light:
  • Check for loose connections.
  • Ensure the cell has enough charge.
  • Check if the filament inside the bulb is broken.

Applications in Daily Life:

• Electric cells and bulbs are used in flashlights, torches, and emergency lights.

Fun Activity:

• Create a simple circuit with an electric cell, bulb, and wires. Experiment with adding a switch to control the circuit.

Let’s practice!