Individual RCL in AC Circuits

Let us review the characteristics of current against the voltage if were to connect a resistance and an inductance across aa AC power supply.

The connections are given below. Please view the RC circuit (resistant and inductance)

Resistance/ Inductance / and Capacitive Curcuits 

A. Resistive Circuit.
This exists in theory only, a circuit will always have inductance and capacitance value.
As the voltage is applied directly on the resistor, and it a known variable, it is taken as the reference. Then we need to know the characteristics of the current, is it in phase with the voltage?
As there is no inductance and capacitance, the current will be directly proportional to the applied voltage and it is exactly in phase.
The following points are to be noted:
- The value of the voltage and current is always quoted in RMS value.
- To draw a graph, the instantaneous current value is given by the formula  I=V/R