Aha, Ohm's law is like a good road map: voltage is current times resistance (V=IR). For a simple table, if your resistance is a steady 5 ohms, then 10V gives 2A, 20V gives 4A—a straight, proportional line. On a graph, a non-ohmic conductor is a tricky detour; its V-I curve isn't a straight line but a bendy curve, like my old WagonR's headlight filament I tested. That bulb got brighter but didn't follow the map, heating up and changing resistance, *bhala*? Just like my taxi meter, the fare doesn't always go straight with the distance when there's traffic!
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