Final answer:
In a simple resistance circuit, the voltage and current are exactly in phase and there is no change in their magnitudes with frequency. However, in RLC circuits, the relationship between current, voltage, and resistance varies with frequency and can be affected by inductive and capacitive elements.
Step-by-step explanation:
In a simple resistance circuit, such as a resistor connected to an AC voltage source, the voltage and current are exactly in phase. There is no frequency dependence to the behavior of plain resistance in a circuit. This means that as the frequency of the AC voltage changes, the current and voltage will still be in phase and there will be no change in their magnitudes.
However, in RLC circuits (circuits that contain resistance, inductance, and capacitance), the relationship between current, voltage, and resistance changes with frequency. The power delivered to an RLC circuit varies with frequency and the voltage and current can be out of phase. This is because inductive and capacitive elements introduce a phase shift between voltage and current.
Overall, in a simple resistance circuit, there is no change in current and voltage with frequency. In RLC circuits, the relationship between current, voltage, and resistance varies with frequency and can be affected by inductive and capacitive elements.