We know we must start at the bottom left corner where voltage and current equals zero, as no voltage across a resistance means no current. The next point for the 1ohm resistance would be one unit (1 volt) to the right and one unit up (1 amp); and for the 10ohm resistance, it would be ten units to the right and one unit up. Remember, the lines continue infinitely, as the relationship between voltage and current defined by the line is constant. So if we follow the 1ohm line out to 100 kV, we know that the current will be 100 kA. Of course, no 1ohm resistor on earth could withstand the test; but the issue here is pure resistances and not necessarily actual physical resistors. The plotting of these two resistances reveals a key feature of graphing resistances: the lower the resistance, the steeper the line defined; and the higher the resistance, the flatter the line defined. This will prove valuable when working with tubes, as this principle allows quick inspection of plate resistances. Given that both graphs share the same XY scales, the steeper set of plate curves belongs to the vacuum tube with the lower plate resistance. As the Ohm's Law formula is so simple, plotting different resistance values is usually of little value. But if we place two resistances in series and set a B+ voltage, then we can graphically see the voltage division between resistances.
