# Non-conservative Electric Field

I was watching this video from Walter Lewin and while watching these two videos, I noticed there is a "contradiction" in what he is doing. All links direct you exactly to where he begins, so you don't have to search it yourself

LR Circuit

Resistor Circuit (Kirchoff's Law)

In the LR Circuit video, he sets his current to run CCW and traverses CCW. Then he mentions about the electric field present in the circuit and he sets up the equation:

$$+IR - V = -L\frac{\mathrm{d} I}{\mathrm{d} t}$$

In the Resistor Circuit (Kirchoff's Law) video, he talks about potentials going up and down. He prepared beforehand for us the direction of the current in the circuit. He begins at point P, he traverses the circuit CCW (in the direction of the current). This time, however, he didn't mention anything about the electric field present in the circuit. As he traverses the outer loop, he gets the equation:

$$-6 + 20 - 1 - 2 - \varepsilon_2 - 4 = 0$$

Notice that he gets $-6$ this time when he traverses in the direction of the current? As opposed from the LR Circuit video, he gets $+IR$ when he traverses in the direction of the current.

Could someone please clarify what is going on? Thank you very much. I am unable to progress because of this confounding concept

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