Job Recruitment Website - Job seeking and recruitment - (2009? Nanning) In the circuit shown in the figure, when the metal clip slides to the left on the pencil lead (the clip is in good contact with pencil lead), make the following statement.
(2009? Nanning) In the circuit shown in the figure, when the metal clip slides to the left on the pencil lead (the clip is in good contact with pencil lead), make the following statement.
When the metal clip slides to the left, the length of the pencil lead access circuit becomes shorter, the total resistance R of the circuit becomes smaller, and the power supply voltage U remains unchanged. It can be seen from I=UR that the circuit current I becomes larger.
The bulb resistance RL remains unchanged, the bulb voltage, that is, the voltage expression number UV=UL=IRL, the actual power PL=IUL of the bulb increases, and the bulb becomes brighter.
So choose B.
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