Alternating Current

Success Criteria:

1. Recognize that current and voltage in an AC circuit are in phase.

2. Determine the phase difference and direction between current and voltage for an inductor and for a capacitor.

3. Use equations and graphs to depict the phase and amplitude relationship of V and I in an LCR circuit.

4. Use phasor diagrams to show the relationship between V(total), V(R), V(L) and V(C) in an AC LCR circuit.

5. Use the resistance, capacitor reactance and inductor reactance to calculate the impedance of an LCR circuit.

6. Determine from phasors that the current in an LCR circuit will be at a maximum when VL = Vc and use this knowledge to calculate the resonant frequency equation