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目录
移至侧边栏
隐藏
开始
1
导体性质
2
电阻与温度
3
欧姆定律
4
功率传递
5
功
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电子学/公式
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外观
移至侧边栏
隐藏
来自维基教科书,开放世界开放书籍
<
电子学
电子学
|
前言
|
基础电子学
|
复杂电子学
|
电学
|
机器
|
电子学史
|
附录
|
编辑
导体性质
[
编辑
|
编辑源代码
]
电压
V
=
W
Q
{\displaystyle V={\frac {W}{Q}}}
电流
I
=
Q
t
{\displaystyle I={\frac {Q}{t}}}
能量
E
=
W
t
=
W
Q
Q
t
=
V
⋅
I
{\displaystyle E={\frac {W}{t}}={\frac {W}{Q}}{\frac {Q}{t}}=V\cdot I}
电导
Y
=
I
V
=
1
R
{\displaystyle Y={\frac {I}{V}}={\frac {1}{R}}}
电阻
R
=
V
I
=
1
Y
{\displaystyle R={\frac {V}{I}}={\frac {1}{Y}}}
电阻与温度
[
编辑
|
编辑源代码
]
导体的电阻随温度升高而增大
对于导体
R = R
o
+ N T
对于半导体
R
=
R
o
e
N
T
{\displaystyle R=R_{o}e^{N}T}
欧姆定律
[
编辑
|
编辑源代码
]
电阻
R
=
V
I
{\displaystyle R={\frac {V}{I}}}
电压
V
=
I
⋅
R
{\displaystyle V=I\cdot R}
电流
I
=
V
R
{\displaystyle I={\frac {V}{R}}}
功率
P
=
I
⋅
V
{\displaystyle P=I\cdot V}
功率传递
[
编辑
|
编辑源代码
]
通过电阻网络传递的电功率等于电源功率减去电阻网络电阻产生的热损耗功率
电源功率
P
v
=
I
V
{\displaystyle P_{v}=IV}
电功率损耗
P
r
=
I
2
R
=
V
2
R
{\displaystyle P_{r}=I^{2}R={\frac {V^{2}}{R}}}
传递的电功率
P
=
P
v
−
P
r
{\displaystyle P=P_{v}-P_{r}}
P
=
I
V
−
I
2
R
=
I
(
V
−
I
R
)
{\displaystyle P=IV-I^{2}R=I(V-IR)}
P
=
I
V
−
V
2
R
=
V
(
I
−
V
R
)
{\displaystyle P=IV-{\frac {V^{2}}{R}}=V\left(I-{\frac {V}{R}}\right)}
功
[
编辑
|
编辑源代码
]
W
=
P
⋅
t
{\displaystyle W=P\cdot t}
W
=
F
⋅
s
{\displaystyle W=F\cdot s}
W
=
F
⋅
s
⋅
cos
θ
{\displaystyle W=F\cdot s\cdot \cos \theta }
类别
:
书籍:电子学
华夏公益教科书