Fig. 6. (Color online) The graphical comparison of the measured current Im of the I -V characteristic curve, the graphical current Ig by the graphical method, and the current of auxiliary function Ia with the auxiliary current function Ia(V) according to the terminal voltage V in a tungsten filament electric bulb of 2.5 V−0.3 A with the room temperature resistance R0=1.3 Ω.
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