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- Engineering
- Thread starter Doomkey
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- #2

berkeman

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Welcome to PhysicsForums.Homework Statement::Determine the loop currents i1 to i4 in the electrical network shown

Relevant Equations::I in = I out V = IR

I'm stuck straight out of the gate any help is really appreciated

We are not allowed to help you until you show your best efforts to work the problem.

Start by listing the KVL equations for each loop. They say how you would go about solving those simultaneous equations...

- #3

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70i1-50i2-30i3=240v for the i1 loop

100i2-50i1-25i4-10i3=240v for the i2 loop

65i3-10i2-30i1-20i4=240v for the i3 loop

50i4-25i2-20i3=240v for the i4 loop

my problem is I'm not confident I'm making the simultaneous equations correctly, but if I am then I can simply fiddle around with them until I get a result for one of the loops then plug that back into the other equtions and work from there

- #4

gneill

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Check the resistor sum for i4 in your final equation.

edit: Also check the resistor sum for i1 in your first equations! What's 50 + 30?

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- #6

gneill

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Nope. The 120 V potentials are only at the top nodes of the diagram. After that there are resistors in the way, so potential drops due to current flows.I thought the PD for the whole circuit would be 240V and as they're all in parallel shouldn't they all have the same PD?

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- #8

gneill

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