Electrical engineering task – mesh law?
Hello everyone,
I have a problem in electrical engineering that I can't get past.
To calculate the current, we redrawn the circuit as shown in my sketch below, and I inserted the mesh (I don't yet know which direction the resistor arrows point, so I assumed it was possible and just drew something; I don't know if that will work). We got the redrawn circuit from the solutions, but apparently I drew the resistor arrow directions incorrectly or made a mistake somewhere else. I get a current of 7.5 A, but the solution corresponds to 0.833 A.
Can anyone help me with task 1, part 1?
(No Ratings Yet)
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You drew the clockwise direction, but you already counted U1 with negative sign. It must be counted with positive sign.
In addition, the direction of the arrows over the resistors is not only wrong but also superfluous 🙂
You have a series connection, the same current flows everywhere.
For general you look at the arrows:
The total resistance is:
Then
Ampere, of course, not Ohm. Small typing error
Hello,
Thank you! Why must U1 be chosen positively. In the task, U1 is drawn upwards and U2 downwards. I just haven’t understood exactly when I need to draw U1 positively or negatively.
Thank you for the explanation with the power!
You drew this blue open circle with the arrow. It’s called the reverse direction. So how about I move along the mash?
All that looks in the same direction of movement is positive. All that is contrary, negative.