KCL/KVL Theory Video by Dave Jones Dave was a student here many years before 🙂 I met up with Dave at the Electronics Expo held at the Technology Park in Redfern 12 months ago. Rules for nodes: 1) Convert all voltage to current sources 1) Determine a reference node and identify unknown relative voltages 2) Use KCL at each unknown node.
KCL and KVL • 1. ACTIVELEARNINGASSIGnMENT CIRCUITS AND NETWORKS(2130901) Prepared by Group - 1 Div- B Sem-3rd Branch-Electrical Guided by: Prof. Megha Ma’m GANDHINAGAR INSTITUTE OF Technology. • Brijesh Patel -30 Kavan Patel -32 Darshil Shah -50 Group: 1 PREPAREDBY: ENROLLMENTNO. • TOPIC NAME: •KIRCHHOFF’S LAWS.
• TYPES OF LAWS: Kirchhoff’s laws. KIRCHHOFF’S CURRENT LAW(KCL) KIRCHHOFF’S VOLTAGE LAW (KVL) These laws are first derived by Guatov Robert Kirchhoff and hence these laws are also referred as Kirchhoff Laws.
Kcl Kvl Calculator
• Circuit Definitions Node – any point where 2 or more circuit elements are connected together Wires usually have negligible resistance Each node has one voltage (w.r.t. Storejet 600 for mac. Ground) Branch – a circuit element between two nodes Loop – a collection of branches that form a closed path returning to the same node without going through any other nodes or branches twice • Kirchhoff's Current Law (KCL) The algebraic sum of currents entering a node is zero Add each branch current entering the node and subtract each branch current leaving the node Σ currents in - Σ currents out = 0 Or Σ currents in = Σ currents out (IB + IC + ID) - IA = 0 Then, the sum of all the currents is zero. This can be generalized as follows, • Kirchhoff's Voltage Law (KVL) “The algebraic sum of all voltages around a closed loop must be equal to zero”. Σ voltage drops - Σ voltage rises = 0 Or Σ voltage drops = Σ voltage rises That means, V1 + V2 + V3 +.. + Vm − Vm + 1 − Vm + 2 − Vm + 3 +..− Vn = 0. So accordingly Kirchhoff Second Law, ∑V = 0.
• Ideal voltage and current source. VOLTAGE SOURCE CURRENT SOURCE • Voltage rise and voltage drop: Voltage drop Voltage rise • Example. Find the current through 8Ω resistor using KIRCHHOFF’S LAWS.
Kirchhoff's Laws Kirchhoff's current law and voltage law, defined by Gustav Kirchhoff, describe the relation of values of currents that flow through a junction point and voltages in a an electrical circuit loop, in an electrical circuit. • • Kirchhoff's Current Law (KCL) This is Kirchhoff's first law. The sum of all currents that enter an electrical circuit junction is 0.
The currents enter the junction have positive sign and the currents that leave the junction have a negative sign: Another way to look at this law is that the sum of currents that enter a junction is equal to the sum of currents that leave the junction: KCL example I 1 and I 2 enter the junction I 3 leave the junction I 1=2A, I 2=3A, I 3=-1A, I 4=? Solution: ∑ I k = I 1 +I 2 +I 3 +I 4 = 0 I 4 = -I 1 - I 2 - I 3 = -2A - 3A - (-1A) = -4A Since I 4 is negative, it leaves the junction. Kirchhoff's Voltage Law (KVL) This is Kirchhoff's second law. The sum of all voltages or potential differences in an electrical circuit loop is 0. KVL example V S = 12V, V R1 = -4V, V R2 = -3V V R3 =?