Li-Ion or Lithium batteries are one of the most common batteries used today.
We can find this type of batteries in mobile phones, wireless headphones, SAIS, smart watches, cars etc.

Lithium is a very light metal capable of generating ions easily so it is ideal for the manufacture of batteries.

Unlike other types of batteries are a bit more expensive, but acThey are much smaller and lighter, capable of doubling the duration of a Ni-Cd.

Thanks to their composition can be manufactured in different ways, adapting to the device where they should be located, as well as its low memory effect makes them ideal for any type of device.

Summing up their positive points:

• Easy to find
• Many different sizes and shapes
• Small size

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

The dBm (sometimes also dBmW or decibel-milliwatt) is a unit of measurement of power expressed in decibels (dB) relative to one milliwatt (mW). It is used in radio networks, microwave and optical fiber as a convenient measure of absolute power because of their ability to express both very large and very small values ??in short form. It is distinct from dBW, which refers to one watt (mW 1,000). Typical values:

• 21 DBM-> 125 MW> Maximum output power for a mobile phone UMTS/3G (phone power class 4).
• 15 DBM-> 32 MW> Typical power transmission WiFi laptops.
• 0 DBM-> 1.0 mW = 1000 ?W-> Standard Bluetooth Class 3 coverage 1m.
• DBM- -10> 100 ?W-> Typically the maximum Potentiometeria that can be received on a wireless network (-10 to -30 dBm).
• -194 DBM-> 0.00004 AW-> thermal noise bandwidth of 1 Hz in outer space (4 kelvin).

It is normally used dBm optical fiber, external radio networks, microwave. This measure, which also can be called dBmW is a measure that is in decibels relative to one milliwatt. The main idea is to measure dBm power factors.

One hertz is one cycle per second, meaning repeating cycle as an event. For example, hertz is applied physics measuring the number of times for a second wave (either acoustic or electromagnetic) is repeated or can be applied, among other uses, to ocean waves that reach the Beach vibrations per second or a solid. The quantity that measures the frequency hertz is called,in this regard, the inverse of the period. One hertz is an oscillation frequency of suffering a particle over a period of one second.