The brightness of a bulb

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What do you think would happen to the brightness of a bulb if more cells were added to a circuit? What about if the same amount of cells were used but more bulbs were added to the circuit?


Year Four planned out investigations surrounding these questions. We used electrical equipment to test or predictions, and found out that the bulb became brighter if more cells were added. When we added more bulbs but kept the same amount of cells, the bulbs became dimmer.