阿Q吧 > 一个小灯泡上标有“6V--3W”字样，若把这个小灯泡接在9V电源上正常发光，需要串联一个多大电阻？该电阻的

一个小灯泡上标有“6V--3W”字样，若把这个小灯泡接在9V电源上正常发光，需要串联一个多大电阻？该电阻的

2025-04-05 05:11:02
推荐回答（1个）
回答1：

∵P=UI，
∴灯泡正常发光时的电流I=

PL
UL
=
3W
6V
=0.5A，
串联电阻两端电压UR=U-UL=9V-6V=3V，
∵I=
U
R
，
∴串联电阻阻值R=
UR
I
=
3V
0.5A
=6Ω；
串联电阻的功率PR=URI=3V×0.5A=1.5W；
答：需要串联一个6Ω的电阻；该电阻的电功率是1.5W．

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