Question

a circuit is a path that allows electrons to flow. below is an example of a parallel circuit passing through light bulbs.
a parallel circuit has more than one path for electrons to flow. in this parallel circuit, electricity can flow to any of the light bulbs because each light bulb has its own path.
advantages to parallel circuits
if one or more bulbs burn out, the rest stay lit.
all bulbs burn at the same brightness.
disadvantages to parallel circuits
requires more wire
choose the correct answer.
which of the bulbs in the picture will burn the brightest?
bulbs b and c
all bulbs will have the same brightness.
bulbs a and b

Explanation:

In a parallel circuit, the voltage across each component (here, the light - bulbs) is the same. The brightness of a light - bulb is determined by the power it dissipates, and the power formula for a resistor (a light - bulb can be considered as a resistor) is \(P=\frac{V^{2}}{R}\) (where \(V\) is the voltage across the resistor and \(R\) is the resistance of the resistor). Since \(V\) is the same for all bulbs in a parallel circuit (assuming the bulbs have the same resistance, which is a reasonable assumption unless stated otherwise) and \(R\) is also the same (for identical bulbs), the power \(P\) (and thus the brightness) will be the same for all bulbs.

Answer:

All bulbs will have the same brightness.