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u see the light bulbs on a series circuit's brightness evolves and the brightness on a parallel's circuit dont
The Pencil lead
number and voltage of the cells in the circuit resistance of each bulb
-- If the bulbs are in parallel, then the addition of a bulb has no effect on the brightness of those that were there before. -- If the bulbs are in series, then the addition of a bulb causes the brightness of those that were there before to decrease. (And I wasn't even there when you did the experiment !)
Two bulbs connected in parallel are brighter than two connected in series. The resistance of the circuit is lower, electrons can flow more easily.
A pencil has nothing to do with the brightness of a light bulb.
u see the light bulbs on a series circuit's brightness evolves and the brightness on a parallel's circuit dont
because the pencil take the a litte enrgy.
If the bulb is of the incandescent variety, then reducing the current in the circuit will do this.
ANSWER: The brightness of both bulbs will decrease. If the bulbs are identical the current will decrease to 0.2 Amps. This is a simple series resistive circuit, the more bulbs you add in series both the amperage and bulb brightness will continue to go down.
The Pencil lead
Then the brightness of the light buld increases.
it should become dimmer
if light is low it can cuase the bulb brightnees.
number and voltage of the cells in the circuit resistance of each bulb
The brightness of each bulb in a parallel circuit is the same as the brightness of a bulb in a simple circuit. By Kirchoff's voltage law, each element of a parallel circuit has the same voltage drop across it. With the same voltage, the same type of bulb will dissipate the same power, and have the same brightness.
A parallel circuit will not effect the other bulb. If the bulbs are in a series circuit the other bulb will not turn on.