One ohm is defined as the resistance of a circuit in which a 1-amp current flows when 1 volt is applied.
One reason resistors are used in electronic circuits is to control the amount of current that flows for a particular applied voltage.
One reason inductors are used in electronic circuits is to reduce the flow of AC while allowing DC to pass freely.
One reason capacitors are used in electronic circuits is to block the flow of direct current while allowing alternating current to pass.
If two equal-value inductors are connected in parallel, their total inductance is half the value of one inductor.
If two equal-value capacitors are connected in series, their total capacitance is half the value of either capacitor.