Electrical cells in series in Electricity Current and it’s Effects – Class 7 Science Experiment

Chapter Name: Electricity Current and it’s Effects

Activity Name: Electrical cells in series in Electricity Current and it’s Effects

Activity Description:

Electrical cells in series in Electricity Current and it’s Effects - Class 7 Science Experiment

This experiment involves connecting a dry cell to a torch bulb using copper wires and observing the intensity of the light. Two scenarios are explored: one where a single cell is used, and another where two cells are connected in series to the bulb.

Required Items:

  1. Dry cells, torch bulb, copper wires.

Step by Step Procedure:

  1. Take a single dry cell and connect it to the torch bulb using copper wires.
  2. Observe the intensity of the light produced by the bulb.
  3. Connect two dry cells in series by connecting the positive terminal of the first cell to the negative terminal of the second cell.
  4. Connect the series arrangement of cells to the bulb using copper wires.
  5. Observe and compare the intensity of the light produced by the bulb in this case.

Experiment Observations:

  • Note the intensity of light produced by the bulb when connected to a single cell and when connected in series with two cells.


Handle the dry cells and copper wires carefully. Make sure the connections are secure and proper to avoid accidents or short circuits.

Lesson Learnt from Experiment:

Connecting dry cells in series increases the voltage supplied to the bulb, resulting in a brighter glow compared to using a single cell. The arrangement of cells affects the intensity of the bulb’s light.

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