VDC would be the abbreviation for Volt Direct Current which translated would volts direct current. The idea of ??this type is unidirectional current to the load. Direct current is normally produced by batteries, thermocouples, solar cells and a dynamo electric machine type. The direct current can flow in conductors such as wires, but may also flow through semiconductors, insulators ... In the image: 1 - current per pulse 2 - Direct Current (DC) 3 - Alternating Current (AC) 4 - Variable Current

Although there are infinity tips as manufacturers or type of use, these are the most commonly tips used in the electronics industry, hardware or electricity.

1. Slot: Characterized by its flat and elongated tip.

2. Phillips: It may be the most used, its tip is shaped like a four-pointed star. Also called commonly screwdriver

3. Pozidriv: Like the previous model, but with a twist. Inside it has 4 slots in a star more.

4. Torx: Widely used in vehicles, its shape is a star with 6 points.

5. Security Torx: Same as above, but inside has a pin.

6. Hex: Point-shaped or hexagon Allen calls. Such tips are distinguished from the rest because they are able to withstand higher torque strength.

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.

Induction charging is a process by which a device can be a charger without direct contact.

Electrification or charging by induction is carried out when a body with an electric charge approaches another with a neutral charge, which causes a redistribution of charges due to the repulsion between them or when the neutral charge is rearranged upon receiving a nearby body with electric charge.

This reorderingor redistribution causes some areas to be loaded positively or negatively, by loading the device.

We can mostly find this charging system in mobile phones or smart watches which can be charged without connecting them with cable, it is only necessary to leave them in the induction base and the charging procedure will be performed automatically.

It must be said that not all devicesthey are of this technology, but it is possible in many cases to adapt them.