why armature resistance is very low as compare to field resistance in dc motor
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It is the ohm.
Are you talking about Ohm's Law. Voltage = (Current) x (Resistance). Georg Ohm
"Ohmic" means it obeys Ohm's law (V=IR, i.e., voltage = current x resistance). Since Ohm's law can be understood to be a definition of resistance, what this really means is that the material has a constant resistance. In such a case, the slope of current as a function of voltage will be a straight line passing through the origin.
Arithmetic and basis algebra are good skills to have. For example, Ohm's Law says Voltage = Current x Resistance. If you know Resistance and Voltage and want to solve for current you need to know that Current = Voltage / Resistance.
Yes.