ARTICLES DC Circuit Rules By StudyMaterialz - October 27, 2021 0 268 FacebookTwitterPinterestWhatsApp DC Circuit Rules Ohm’s law I = V / R Joule’s law P = V · I = I 2 · R = V 2 / R Series circuit rules VT = V1 + V2 + V3 + … IT = I1 = I2 = I3 = … RT = R1 + R2 + R3 + … 1/CT = 1/C1 + 1/C2 + 1/C3 + … LT = L1 + L2 + L3 + … Parallel circuit rules VT = V1 = V2 = V3 = … IT = I1 + I2 + I3 + … 1/RT = 1/R1 + 1/R2 + 1/R3 + … CT = C1 + C2 + C3 + … 1/LT = 1/L1 + 1/L2 + 1/L3 + … Voltage division V1 = VT ⋅ R1 / (R1+R2+R3+…) Current division I1 = IT ⋅ (R2+R3+…) / (R1+R2+R3+…) Kirchhoff’s voltage law (KVL) The sum of voltage drops at a current loop is zero: ∑ Vi = 0 Kirchhoff’s current law (KCL) The junction between several circuit elements is called a node. The sum of the currents values at a node is zero: ∑ Ii = 0 Capacitance C = Q / V Parallel plate capacitor C = ε ⋅ A / l ε is the permittivity in farad per meter (F/m). Permittivity ε = ε ⋅ εr ε is the permittivity in the vacuum. εr is the relative permittivity or dielectric constant. Current of capacitor IC(t) = C dVC(t) / dt Voltage of capacitor VC(t) = VC(0) + 1/C ∫ IC(t)⋅dt Voltage of capacitor VL(t) = L dIL(t) / dt Current of inductor IL(t) = IL(0) + 1/L ∫VL(t)⋅dt Energy of capacitor WC = C⋅V 2 / 2 Energy of inductor WL = L⋅I 2 / 2 READ HERE Working Principle of DC Motor