Shingles is the reactivation of a viral infection in the nerves to the skin that causes pain, burning, or a tingling sensation, along with an itch and blisters in the skin supplied by the affected nerve. It is caused by the varicella zoster virus[1] , or VZVâthe same virus that causes chickenpox.
Types of electrical circuits. There are three main types of circuits encountered in a domestic situation. They are ring circuits, radial circuits and lighting circuits.
A simple electrical circuit. This circuit has a power source, a complete path for electrons to flow, and a resistor as the load. An electric circuit is a path in which electrons from a voltage or current source flow. The point where those electrons enter an electrical circuit is called the source of electrons.