标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到六伏电源上,求甲,乙两灯实际功率各多大?标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到6伏电源上,求甲,乙两灯实际功率各多大?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/18 00:00:38
![标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到六伏电源上,求甲,乙两灯实际功率各多大?标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到6伏电源上,求甲,乙两灯实际功率各多大?](/uploads/image/z/9576199-55-9.jpg?t=%E6%A0%87%E6%9C%89%E2%80%9C6V+3W%E2%80%9D%E7%9A%84%E7%94%B2%E7%81%AF%E4%B8%8E%E2%80%9C6V+9W%E2%80%9D%E7%9A%84%E4%B9%99%E7%81%AF%E4%B8%B2%E8%81%94%E5%90%8E%E6%8E%A5%E5%88%B0%E5%85%AD%E4%BC%8F%E7%94%B5%E6%BA%90%E4%B8%8A%2C%E6%B1%82%E7%94%B2%2C%E4%B9%99%E4%B8%A4%E7%81%AF%E5%AE%9E%E9%99%85%E5%8A%9F%E7%8E%87%E5%90%84%E5%A4%9A%E5%A4%A7%3F%E6%A0%87%E6%9C%89%E2%80%9C6V+3W%E2%80%9D%E7%9A%84%E7%94%B2%E7%81%AF%E4%B8%8E%E2%80%9C6V+9W%E2%80%9D%E7%9A%84%E4%B9%99%E7%81%AF%E4%B8%B2%E8%81%94%E5%90%8E%E6%8E%A5%E5%88%B06%E4%BC%8F%E7%94%B5%E6%BA%90%E4%B8%8A%2C%E6%B1%82%E7%94%B2%2C%E4%B9%99%E4%B8%A4%E7%81%AF%E5%AE%9E%E9%99%85%E5%8A%9F%E7%8E%87%E5%90%84%E5%A4%9A%E5%A4%A7%3F)
标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到六伏电源上,求甲,乙两灯实际功率各多大?标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到6伏电源上,求甲,乙两灯实际功率各多大?
标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到六伏电源上,求甲,乙两灯实际功率各多大?
标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到6伏电源上,求甲,乙两灯实际功率各多大?
标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到六伏电源上,求甲,乙两灯实际功率各多大?标有“6V 3W”的甲灯与“6V 9W”的乙灯串联后接到6伏电源上,求甲,乙两灯实际功率各多大?
P=U*U/R
R=U*U/P
R1=36/3=12欧 R2=36/9=4欧
I=U/(R1+R2)=6/16
P1=I*I*R1=1.6875W
P2=I*I*R2=0.5625W
先求两灯的电阻:
R1=U^2/P1=(6V)^2/3W=12Ω
R2=U^2/P2=(6V)^2/9W=4Ω
第二步求两灯串联时各灯的电压
U1/U2=R1/R2=12/4
U1=(12/16)U=(12/16)*6=4.5V
U2=U-U1=6V-4.5V=1.5V
P1'=U1^2/R1=(4.5V)^2/12Ω=1.69W
P...
全部展开
先求两灯的电阻:
R1=U^2/P1=(6V)^2/3W=12Ω
R2=U^2/P2=(6V)^2/9W=4Ω
第二步求两灯串联时各灯的电压
U1/U2=R1/R2=12/4
U1=(12/16)U=(12/16)*6=4.5V
U2=U-U1=6V-4.5V=1.5V
P1'=U1^2/R1=(4.5V)^2/12Ω=1.69W
P2'=U2^2/R2=(1.5V)^2/4Ω=0.56W
答:当两灯串联后,甲灯的实际功率是1.69W,乙灯的实际功率是0.56W。
收起
我高三帮你,P甲=1.6875W P乙=0.5625W 记得帮我顶