Adding more cells in series increases the brightness of the light in a circuit by raising the potential difference, showcasing the effect on the current strength and potential difference.
Increasing the number of cells in series in a circuit affects both the current strength and potential difference. When more cells are added, the total voltage increases as it is the sum of the individual cell voltages. For example, if you add more cells in series to power a light bulb, the brightness of the bulb will increase because it receives more voltage.
In a practical investigation, you would observe a similar effect when adding cells in series to power an electric lamp or a torch; the brightness of the light source would increase. This is due to the higher total potential difference across the circuit resulting in a brighter output.
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