Alternating Current Circuits
Alternating currents and voltages are sinusoidal and vary with time. 
Alternating currents produce different responses in resistors, capacitors, and inductors than direct currents do. 
Alternating currents and voltages
Shows the plot of alternating voltage and alternating current as a function of time in a circuit that has only a resistor and a source of alternating current — an ac generator.