We need three equations—Kirchhoff's loop rule:
around each loop
Kirchhoff's junction rule:
at each junction
and Ohm's Law
We don't know i3, but we know the other two currents, all the resistances, and one of three EMFs/voltages. Three unknowns: we need three equations.
(a) Find the emf ε1 in the circuit of the figure (Figure 1) .
(b) Find the emf ε2 in the circuit of the figure.
(c) Find the potential difference of point b relative to point a
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What scientific concept do you need to know in order to solve this problem?
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Based on our data, we think this problem is relevant for Professor Cooney's class at UCF.