# In a series circuit, what happens to the resistance when one out of 2 bulbs is removed? What about in a parallel circuit?

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- billrussell42Lv 74 weeks ago
1. current goes to zero, bulbs are off. you have an open circuit. Total R is infinite.

IF you mean the removed bulb is replaced by a short, then, assuming bulbs are identical, current increases, resistance decreases. Impossible to tell how much as light bulbs are very non-linear. IF bulbs are assumed linear resistors, then resistance is one half. 2. current goes in half, resistance is twice. Bulb sees same voltage and brightness does not change.

- VamanLv 74 weeks ago
Voltage increases. Bulb becomes brighter. Resistance decreases.Voltage does not change when bulbs are parallel. All house hold connections are parallel.

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