Christmas light webquest

How does the type of circuit affect the strand of Christmas lights with burned out bulb?

I.V. is type of circuit

D.V. is strand of Christmas lights with a burned out bulb.

If the Christmas lights arranged in a parallel circuit then when 1 light bulb bursts the other bulbs still light up.  

When all three are connected on both sides of the light bulb and battery they light up.   

when you take off one they still light up as long as there connected.

If the Christmas lights are arranged in a series circuit then when 1 bulb bursts the other light bulbs still light up.

When All three are by another they are not as bright.

when 1 light bulb is removed they brighten up more.

they conclusion is in picture.

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