Xem mã nguồn của Sách điện/Mạch điện/Mạch điện 2 cổng Điện trở

== Mạch Chia Điện ==
[[Image:Voltage_divider.svg|150px|right]]  
:<math>i = \frac{V}{R_2 + R_1}</math>
:<math>V_o = i R_2 = R_i \frac{v_i}{R_2 + R_1}</math>
:<math>\frac{V_o}{V_i} = \frac{R_2}{R_2 + R_1}</math>
:<math>\frac{V_o}{V_i} = \frac{R_2}{R_2 + R_1}</math>

==Mạch T ==
[[Image:Superposition_Example.svg|right]] 
:<math>V = V_2 \frac{R_1}{R_1 + R_3} = V_1 \frac{R_1}{R_2 + R_1}</math>
:<math>\frac{V_2}{V_1} = \frac{R_1 + R_3}{R_1} \frac{R_1}{R_2 + R_3}</math>
:<math>\frac{V_2}{V_1} = \frac{R_1 + R_3}{R_2 + R_3}</math>


==Mạch π ==
:<math>i_1 = i_2 + i_3</math> 
:<math>\frac{v_i}{R_1} = \frac{v_i - v_o}{R_2} + \frac{v_o}{R_3} </math>
:<math>\frac{v_i}{v_o}= ( \frac{R_3}{R_1} ) ( \frac{R_2 - R_1}{R_2 - R_3} ) </math>
:<math>\frac{v_o}{v_i}= ( \frac{R_3}{R_1} ) ( \frac{R_2 - R_1}{R_2 - R_3} ) </math>

==Mạch Nối Tiếp Song Song ==
[[Image:Resistorscombo.png|100px|right]] 
:<math>R_{EQ} = (R_1 \| R_2) + R_3</math>
:<math>R_{EQ}  = {R_1R_2 \over R_1 + R_2} +R_3</math>

==Hoán Chuyển ==
: [[Image:Delta-Star Transformation.svg|400px|right]] 
===Δ - Y Hoán Chuyển ===
:<math>R_1 =  \frac{R_\mathrm{a}R_\mathrm{b}}{R_\mathrm{a} + R_\mathrm{b} + R_\mathrm{c}} </math>
:<math>R_2 =  \frac{R_\mathrm{b}R_\mathrm{c}}{R_\mathrm{a} + R_\mathrm{b} + R_\mathrm{c}} </math>
:<math>R_3 =  \frac{R_\mathrm{c}R_\mathrm{a}}{R_\mathrm{a} + R_\mathrm{b} + R_\mathrm{c}} </math>
===Y - Δ Hoán Chuyển ===
:<math>R_\mathrm{a} = \frac{R_1R_2 + R_2R_3 + R_3R_1}{R_2}</math>
:<math>R_\mathrm{b} = \frac{R_1R_2 + R_2R_3 + R_3R_1}{R_3}</math>
:<math>R_\mathrm{c} = \frac{R_1R_2 + R_2R_3 + R_3R_1}{R_1}</math>