Question

if we add more bulbs to a circuit, what happens to the bulbs?
choose your answer by clicking one of the options, then click \ok\.
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section 4 // question 1
changing circuits
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options in section 4:
they go out
they get brighter
they get dimmer
they burn out

Explanation:

When more bulbs are added to a series circuit, the total resistance increases. According to Ohm's Law \(I = \frac{V}{R}\) (where \(I\) is current, \(V\) is voltage, and \(R\) is resistance), if the voltage \(V\) (assuming a constant - voltage source) remains the same and \(R\) increases, the current \(I\) decreases. The brightness of a bulb is related to the power \(P = I^{2}R\) (for a bulb with resistance \(R\)). As the current \(I\) through each bulb (in series, the current is the same through all components) decreases, the power dissipated by each bulb (which determines its brightness) decreases. So the bulbs get dimmer.

Answer:

C. They get dimmer