(20 1 1? Changde) When Xiaoyang does the experiment, connect two light bulbs in parallel to the power supply, as shown in the figure. After turning on the switch, he found that the first lamp didn't shine, and neither did the second lamp. According to the circuit diagram, two lamps A and B are connected in parallel, and the circuit connection is correct. The two lamps are intact, but lamp A does not shine and lamp B does. The brightness of the light bulb is determined by the actual power. Therefore, light A does not emit light, which may be caused by the fact that the actual power of light A is too small. So, A is right and B is wrong.

According to the circuit diagram, lamp A and lamp B are connected in parallel, and the voltage is the same, so C is wrong.

The actual power of lamp A is less than that of lamp B. As can be seen from P=UI, the voltage is the same, and the current flowing through lamp A is less than that flowing through lamp B, so D is wrong.

So choose a.