NỐI TIẾP:
\(\left[{}\begin{matrix}R=R1+R2+...+Rn\\I=I1=I2=..=In\\U=U1+U2+...+Un\end{matrix}\right.\)
SONG SONG:
\(\left[{}\begin{matrix}\dfrac{1}{R}=\dfrac{1}{R1}+\dfrac{1}{R2}+...+\dfrac{1}{Rn}\\I=I1+I2+..+In\\U=U1=U2=..=Un\end{matrix}\right.\)
1. Mắc nối tiếp:
\(U_1+U_2+U_3=U_m\)
\(I_1=I_2=I_3=I_m=\dfrac{U_m}{R_{tđ}}\)
\(R_{tđ}=R_1+R_2+R_3\)
2.Mắc song song:
\(U_1=U_2=U_3=U_m\)
\(I_1=\dfrac{U_1}{R_1};I_2=\dfrac{U_2}{R_2};I_3=\dfrac{U_3}{R_3}\)
\(I_m=I_1+I_2+I_3\)
\(\dfrac{1}{R_{tđ}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\)