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Because the light bulb in series had a larger current which made the bulb brighter.

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They all continued to stay bright and have the same brightness

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A parallel circuit

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The other bulb continues to stay bright

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The brightness of the bulbs increase.

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A series circuit

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They all get dimmer, and less bright because they have to share the current.

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This is because the current has nowhere to go and stops where the bulb was unscrewed. There is no longer a continuous current.

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both the bulbs turn off

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When you add a second bulb, they both become less bright because they have to share the current.

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The more resistance means less current, the less resistance means more current.

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When you add another battery to the circuit, the light bulb gets brighter