Help with finding mesh currents and nodal analysis

In summary, the conversation involves a person seeking help with understanding Kirchoff's law and other concepts related to electrical engineering. They mention that their assignment is due soon and express frustration with their progress. Suggestions are made to seek help from Physics Forums and to check out tutorials on Khan Academy for guidance. A specific link to a helpful resource is also provided.
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Homework Statement
Please can I have some help
Relevant Equations
mesh current and nodal
Hi there, I have managed to work out the kirchoff's law bit but for the other two bits I just cant get started as I can get my head around it, its due in on monday I dont know why I left it so late!
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Welcome to Physics Forums. The way homework help works - you post what you have attempted, then we guide you towards a solution.
Can you post what equations you have set up?
 
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Khan Academy has some good tutorials on this subject.
 
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FAQ: Help with finding mesh currents and nodal analysis

What is mesh current analysis?

Mesh current analysis, also known as loop current analysis, is a method used in electrical engineering to determine the current flowing through each loop in a circuit. By applying Kirchhoff's Voltage Law (KVL) around each mesh (independent loop), you can set up a system of equations that can be solved to find the unknown mesh currents.

How do you apply Kirchhoff's Voltage Law (KVL) in mesh current analysis?

To apply KVL in mesh current analysis, you sum the voltages around a closed loop (mesh) in the circuit. According to KVL, the algebraic sum of all voltages in a closed loop is zero. This means you add up the voltage drops (product of current and resistance) and set the equation equal to zero, accounting for the direction of each mesh current.

What is nodal analysis?

Nodal analysis is a technique used to determine the voltage at various points (nodes) in an electrical circuit. By applying Kirchhoff's Current Law (KCL) at each node, you can set up a system of equations that can be solved to find the unknown node voltages. This method is particularly useful for circuits with multiple interconnected components.

How do you apply Kirchhoff's Current Law (KCL) in nodal analysis?

To apply KCL in nodal analysis, you sum the currents entering and leaving a node. According to KCL, the algebraic sum of currents at a node is zero. This means you write an equation for each node where the sum of incoming currents equals the sum of outgoing currents, using Ohm's Law to express currents in terms of node voltages and resistances.

What are the steps to solve a circuit using mesh current and nodal analysis?

For mesh current analysis: 1) Identify and label each mesh current. 2) Apply KVL to each mesh to set up equations. 3) Solve the simultaneous equations to find the mesh currents. For nodal analysis: 1) Identify and label each node voltage. 2) Choose a reference node (ground). 3) Apply KCL to each node to set up equations. 4) Solve the simultaneous equations to find the node voltages.

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