Question

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 1

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

Answer:

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.

Answer 2

Answer:

it gets dimmer

Explanation:

The higher the resistance to current in the wiring, circuitry, and bulb, the lower will be the current, lower the power, and lower the brightness. Conversely, lower resistance means more brightness.