Kirchhoff's loop rule:
Kirchhoff's junction rule:
We'll assign current directions to the diagram. The junctions are already labeled.
At junction c:
i1 = i2 + i3
In the circuit, we have 3 unknowns (the currents only). We need an expression to substitute for one of the currents so that we remain with only 2 unknowns when working out Kirchhoff's loop rule.
Solving for i2:
i2 = i1 - i3
We'll proceed to Kirchoff's loop rule. With only two unknowns, we'll consider any two loops. We have three loops: Left, right, and outer loop.
Using Kirchhoff’s rules (and given ε1 = 70.7 V, ε2 = 61.4 V, ε3 = 79.9 V) calculate the following:
(a) Find the current in each resistor shown in the figure above.
(b) Find the potential difference between points c and f.
(c) Which point is at higher potential?
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Kirchhoff's Loop Rule concept. You can view video lessons to learn Kirchhoff's Loop Rule. Or if you need more Kirchhoff's Loop Rule practice, you can also practice Kirchhoff's Loop Rule practice problems.