Dry cell in Electricity Current and it’s Effects – Class 7 Science Experiment

Chapter Name: Electricity Current and it’s Effects

Activity Name: Dry cell in Electricity Current and it’s Effects

Activity Description:

Dry cell in Electricity Current and it’s Effects - Class 7 Science Experiment

The objective of this experiment is to investigate the internal components of a dry cell and understand the chemical processes that allow it to produce electric energy. Students will observe the structure of the dry cell and identify the role of each component in the generation of electric current.

Required Items:

  1. Dry cell
  2. Cutting tool (under the supervision of a teacher)
  3. Safety gloves and goggles

Step by Step Procedure:

  1. Ensure safety measures are in place, including the use of safety gloves and goggles.
  2. With the guidance of the teacher, carefully cut open the dry cell using the cutting tool.
  3. Observe and examine the internal components of the dry cell.
  4. Take note of the container made of zinc metal, which serves as the negative terminal in the center.
  5. Identify the carbon (graphite) rod with a metal cap, which serves as the positive terminal.
  6. Observe the mixture of carbon particles and ammonium chloride surrounding the carbon rod.
  7. Take caution not to touch or handle the chemicals directly.
  8. Analyze the role of these components in producing electric energy when the cell is in use.

Experiment Observations:

  • Presence of a zinc container as the negative terminal.
  • Carbon rod with a metal cap as the positive terminal.
  • Mixture of carbon particles and ammonium chloride surrounding the carbon rod.
  • The sealed nature of the dry cell.

Precautions:

  1. This experiment should be performed under the supervision of a teacher or an adult.
  2. Ensure the use of safety gloves and goggles to protect against any potential chemical exposure.
  3. Handle the cutting tool with care to avoid accidents or injuries.
  4. Do not touch or tamper with the chemical components inside the dry cell.

Lesson Learnt from Experiment:

The experiment allows students to understand the internal structure of a dry cell and its chemical composition. They learn that the dry cell produces electric energy through the chemical reaction between the components, which serve as the positive and negative terminals.

Moreover, students gain insights into the limited lifespan of a dry cell as its chemicals are eventually depleted, leading to its inability to supply electric current.

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