德布羅意波長: h m v {\displaystyle {\frac {h}{mv}}} 其中 h = 普朗克常數
電學
I = V R {\displaystyle I={\frac {V}{R}}}
V = W Q {\displaystyle V={\frac {W}{Q}}}
I = Q t {\displaystyle I={\frac {Q}{t}}}
串聯電阻
R = R 1 + R 2 + R 3 + . . . . . . . {\displaystyle R=R_{1}+R_{2}+R_{3}+.......}
並聯電阻
1 R = 1 R 1 + 1 R 2 + 1 R 3 + . . . . . {\displaystyle {\frac {1}{R}}={\frac {1}{R_{1}}}+{\frac {1}{R_{2}}}+{\frac {1}{R_{3}}}+.....}
電阻率
ρ = R A l {\displaystyle \rho ={\frac {RA}{l}}}
P = I V = V 2 R {\displaystyle P=IV={\frac {V^{2}}{R}}}
感應電動勢
ϵ = E Q {\displaystyle \epsilon ={\frac {E}{Q}}}
ϵ = I ( R + r ) {\displaystyle \epsilon =I(R+r)}
交流電
I r m s = I p e a k 2 {\displaystyle I_{rms}={\frac {I_{peak}}{\sqrt {2}}}}
V r m s = V p e a k 2 {\displaystyle V_{rms}={\frac {V_{peak}}{\sqrt {2}}}}
其中 h = 普朗克常數
