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: Adding another cell to the [[circuit]] in series will increase the '''voltage'''.
: With a bigger '''voltage''' a lamp will be brighter and a [[buzzer]] will be louder.
{| class="wikitable"
|-
|[[File:SeriesCircuit1Cell1Bulb.png|center|300px]]
|[[File:SeriesCircuit2Cell1Bulb.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:center;" |A series circuit with one cell and one bulb.
| style="height:20px; width:300px; text-align:center;" |A bulb is a series circuit will be brighter with two cells than with one.
|}