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Choices:
decreases
dimmer
increases
is the same.

When we add another lamp into a series circuit, the total resistance 1)____________, this means that the total current decreases. Also, the potential difference across each of the lamps 2)______________. This means that the lamps all become 3)_____________ . When we add another lamp into a parallel circuit in a new branch, the total resistance 4)_________________, the current through each lamp is the same. Also, the potential difference across each of the lamps 5)____________. This means that the lamps have the same brightness.​