Solve the circuit and find all the currents in the circuit

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AI Thread Summary
The discussion focuses on solving a circuit homework problem using Kirchhoff's laws to find all currents (I's) and the effective voltage (Uef). Participants emphasize the need to write Kirchhoff's Voltage Law (KVL) equations for the circuit loops and clarify that five equations are necessary to solve for the five unknown currents. There is confusion about the circuit element labeled "Ub" and its function, as well as the meaning of "J = 1 A," which is identified as equivalent to I2. The conversation highlights the importance of understanding circuit conventions and the relationships between circuit elements to effectively apply the laws. Understanding these concepts is crucial for successfully solving the circuit problem.
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Homework Statement
Solve the circuit and find all the currents in the circuit.
Relevant Equations
Kirchhoff's circuit laws
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Hello, i have this circuit as a homework. And i have to find all the I's, and Uef, i got stuck at writing Kirchhoff's laws in this circuit, do you think you can help me write them, and also can you explain how can i calculate Uef?
 
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hmzi123 said:
Homework Statement:: Solve the circuit and find all the currents in the circuit.
Relevant Equations:: Kirchhoff's circuit laws

View attachment 263806
Hello, i have this circuit as a homework. And i have to find all the I's, and Uef, i got stuck at writing Kirchhoff's laws in this circuit, do you think you can help me write them, and also can you explain how can i calculate Uef?
Welcome to the PF. :smile:

The PF rules require that you show your best effort at working the problem before we can offer tutorial assistance. Start by writing the KVL equations for the loops that are shown -- we will check your work. Thanks.
 
Ok, I'm sorry. After writing there I don't know how to continue to find any I, and also I don't know how to calculate Uef.
 

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I do not understand the circuit element Ub with the double arrow inside the circle. Can you explain it? Also, what does "J = 1 A" represent and what is its relation to I2?

You have 5 unknown currents, I1-I5. That means you need a total of 5 equations to solve as a system of linear equations.
 
The ub with 2 arrows is the start of the circuit, and J=I2= 1A.
 
hmzi123 said:
The ub with 2 arrows is the start of the circuit, and J=I2= 1A.
Is Ub a battery? If so, do you know its voltage? Also is the convention that the arrows inside the circles point from the negative to the positive pole of the battery?

What does "start of the circuit" mean? You can start anywhere when you apply the voltage rule, no?
 

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