如图所示,灯L标有“6V 3W”字样,电源电压为9V且保持不变.闭合开关S,灯L正常发光,求: (1)电阻R的阻值; (2)灯泡正常发光时电阻R消耗的功率.
如图所示,灯L标有“6V 3W”字样,电源电压为9V且保持不变.闭合开关S,灯L正常发光,求:
(1)电阻R的阻值;
(2)灯泡正常发光时电阻R消耗的功率.
物理人气:972 ℃时间:2019-08-20 05:57:10
优质解答
(1)I=
=
=0.5A,
U
R=U-U
L=9V-6V=3V,
R=
=
=6Ω.
(2)P
R=U
RI=3V×0.5A=1.5W.
答:(1)电阻R的阻值是6Ω.
(2)灯泡正常发光时电阻R消耗的功率1.5W.
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