The brightness of identical bulbs varies depending on whether or not they are connected in series or parallel.(Figure 3) Rank in order, from brightest to dimmest, the identical bulbs A, B, and C. If two bulbs have the same brightness, place one on top of the other.

A full conducting path for an electric current is known as an electric circuit.
When a battery is plugged into the circuit, electrons go from the battery's negative terminal through one or more electrical devices before returning to the battery's positive terminal.
Circuits can be wired in a variety of ways, and these wiring methods can be defined using commonly understood and used language or symbols.
The amount of electrons that pass through the circuit per second determines how much current flows through it.
When working with batteries, raising the voltage likewise raises the circuit's current.
When the brightness of the bulb rises, an increase in current is seen.
Any series bulb that is unscrewed creates an open circuit with no current flowing through it.

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I understand that the question you are looking for is "In the circuit shown in the figure, all the lightbulbs are identical. Which of the following is the correct ranking of the brightness of the bulbs?

(A) A and B have equal brightness, and C is the dimmest.

(B) All three bulbs have the same brightness.

(C) B and C have equal brightness, and A is the dimmest.

(D) A is brightest, C is dimmest, and B is in between.

(E) A is the brightest, and B and C have equal brightness but less than A."