If the load varies, the current will change, but electrons will always flow through the circuit in the same direction. AC is a voltage source that changes from positive to negative and back to positive over time. The functions resistors serve include division of voltage, supply of heat, and light. Resistors are described according to type, resistance, tolerance, and power rating. Perfect capacitors would hold charge indefinitely and not produce any heat.
Energy is stored rather than consumed.
Capacitors are physically two large surface area that are separated from each other by a thin dielectric material. Electrons can move from one side of a capacitor to another through an external connection, but do not move through it. Energy is stored in a capacitor in the form of electrons that have moved from one side to the other. Inductors Inductors are made by coiling conductive wire around a spherical core. This core may be air, iron, or other materials with magnetic susceptibility.