Some 60 Hz current is a three-phase system, with each of the three phases reaching its peak at a different point in the cycle. The three work together in transmission lines and circuit wiring. Some common forms of radiation are x-rays, microwaves, light, and radio waves. Reactance, unlike resistance, does not dissipate energy. Reactance is responsible for the phenomenon known as phase shift, which is the tendency for current in an alternating current circuit to be out of step in time with the voltage of the circuit.
Reactance is a function of frequency and relates to harmonics.
The properly of a material to resist the flow of electrical current. Resistance is a property of all practical circuits to some degree. Current flowing through resistance always results in dissipation of energy, usually in the form of heat. The point of connection between the electrical utility and the customer's electrical system. The overhead or underground cable which brings power to a residence or business from the distribution line.