VAC would be the abbreviation of Volt Altern Current which would be translated Volts of alternating current. The difference between VDC is that its sinusoidal oscillation achieving a more efficient energy transmission.

The alternating current is the energy that we receive in our homes, it is generated in the power plants by means of alternators.

The intensity of this type of current varies with time, and changes direction 50 times throughsecond (50hz). The generated voltage changes in the form of sine wave so it is not constant.

In the image:

1. Current by pulsations.
2. Direct current (DC).
3. Alternating current (AC).
4. Variable current.

CCIR is a committee responsible for regulating the Spanish radio in space, this committee is responsible for standardization to operate in Spain.

It is a special multi point communication for industrial machinery by its format adapted to long distance and heavy machinery. The connector is used to connect the DB9 serial port or popularly called. One characteristic is that it is able to greatly reduce the noise so that the distance is much greater.

A charge-coupled device or CCD (in Spanish "charge coupled device") is an integrated circuit containing a number of linked or coupled capacitors. Under the control of an internal circuit, each capacitor can transfer its electric charge to one or more of the capacitors that are at his side on the PCB. The digital alternative to CCD devices are the CMOS (complementary metal oxide semicondriver) used in some digital cameras and many webcams. Currently the CCD are much more popular in professional applications and digital cameras. In the diagram we can observe 1) photo-diode. 2) electron transfer register. 3) electric charge. 4) Horizontal Registry. 5) Output signal. 6) Amplifier. 7) Entry Light.

Closed circuit television, or CCTV (stands for closed circuit television) surveillance is a technology designed to monitor a variety of environments and activities. It is called closed, that, contrary to what happens with the media, all components are linked. In addition, unlike conventional television, this is a security system designed to

The BNC connector is a connector type, quick connect/disconnect, incoporando more security connector for coaxial cable. Initially designed as a miniature BNC Connector Type C is a type of connector used with coaxial cables like RG-58 and RG-59 RF applications that required a quick connector, suitable for UHF and constant impedance to over a wide range.