What happens to the brightness of bulb A? View Available Hint(s) What happens to the brightness of bulb A? It gets dimmer. It gets brighter. There is no change.

Answer / Explanation:

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The light bulbs in the circuit diagram as shown below are identical. What happens  to the brightness of bulb A when the switch is closed?

a) both bulbs go out

b) the intensity of both bulbs increases

c) the intensity of both bulbs decreases

d) nothing changes

Before switch closed: Va = 12V because of  battery. Vb = 12 because equal resistance  divides 24V in half.  After switch closed: Nothing changes  since (a) and (b) are still at same potential

Therefore, the answer is (D), nothing changes. That is, there is no change.

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