How Much Power Phone Draws From Laptop Usb C
Click on the links below to spring to the relevant sections:
- What is a USB charging port?
- How does a USB charger work?
- Tin can a USB ability module accuse multiple devices?
- Why are some USB chargers faster than others?
- What is the power output from a computer USB port?
- USB ports and cables — an overview
What is a USB charging port?
USB stands for Universal Serial Charabanc (USB), with the computing term 'motorbus' referring to a system that transfers data either betwixt computers or between components within a estimator.
Ports are used to connect i device to another. Such devices include: estimator mice, smart phones, printers and keyboards.
In order to allow these devices to function, the USB port also transfers an amount of electrical current from the main (powered) device (the host) to its peripheral devices.
How does a USB charger work?
A USB network has a host and a device. The host is commonly either a PC or a power module that allows charging straight from the ability supply.
USBs transfer both data and power. Traditionally, power but flowed in one direction — from the host to the device. All the same, advances in power delivery engineering science means that can be transferred in both directions.
The most common type of USB port features iv pins, matching the four wires found in the USB charging cable. The pins on the within permit information to transfer, while the out pins carry the electrical current. A later version of USB includes another 5 pins, with uniform charging cables that feature an extra 5 wires.
At that place are three master types of charging port. They are as follows:
| USB port type | Ability output | Devices that characteristic port |
|---|---|---|
| Standard Downstream Port (SDP) | 0.1A when connected 0.5A when configured for high power | PC, laptop |
| Downstream Port (CDP) | Up to 1.5A | PC, laptop |
| Defended Charging Port (DCP) | More than 1.5A, co-ordinate to charging device | USB ability module, wall charger |
Can a USB power module charge multiple devices?
Yep. USB ability modules are designed to be able to accuse multiple devices at the same fourth dimension.
While voltage will exist standard across the different USB ports, some modules 'share' their electric current beyond ports. This may upshot in slower charging times when more than devices are connected.
Also continue in heed that different devices have different optimum currents from which to accuse. Charging with a lower-than-optimum current can reduce charging time.
Why are some USB chargers faster than others?
This relates to the electric current that a charging point supplies, measured in amps.
Both voltage and current affect how rapidly a device will charge. In social club to protect electronic equipment from overloading, chargers accept the UK's 240V electricity supply and convert it to a standard 5V.
However, the current (in amps) can vary from charging source to charging source. Computers typically only allow 0.5A of current, making charging quite deadening and laborious. Plugs into which yous insert a USB charging string usually offering 1A. Specialised USB charging modules tin offering annihilation from 1–5A.
The cablevision that y'all use to accuse a device can also affect speed. Thinner cables reduce amperage, leading to longer charging times.
What is the ability output from a computer USB port?
Most computer USB ports supply 5V of electricity with a maximum current of 0.5A. This corporeality of current is standard across the majority of computers and ways the overall ability output volition exist 2.5 Watts at best. Later USB designs bring that current up to 0.9A. However, nearly devices attached to a computer'due south USB port will only draw out 0.1A of power unless more than is required.
USB ports and cables — an overview
USB has seen a number of versions over the years, both in terms concrete port shape and charging/data transfer speeds. Depending on the age of your device, you may accept 1 or several versions of USB ports on your devices.
The following tables wait at the major versions and their specifications:
USB versions
| Version | Name | Release date | Transmission rate |
|---|---|---|---|
| USB one.ane | Total Speed USB | 1998 | 12 Mbps |
| USB two.0 | Loftier Speed USB | 2000 | 480 Mbps |
| USB 3.0 | SuperSpeed USB | 2008 | 5 Gbps |
| USB 3.1 | SuperSpeed+ | 2013 | ten Gbps |
Near people will be more familiar with the physical shape of USB connectors. These typically feature a flat rectangular plug (the male person connector) at one end that fits into the port on your figurer or power module (the receptacle). The other end of a charging wire will either feature the same blazon of plug, or one of several shapes that have developed over the years for connecting to different devices.
The tabular array below looks at some of these plugs:
| USB cable type | Image | Official proper name | Description | Compatibility |
|---|---|---|---|---|
| USB-A |  | USB Standard-A | By far the near common type. This will characteristic on 1 end of near all USB cables. | USB ane/2/three type as all uniform with each other |
| USB-B |  | USB Standard-B | This square-shaped plug is oft used to connect computers with printers, scanners or similar devices. | USB 1/2 type B plugs compatible with USB i/two/three receptacle. USB iii.0 plug only compatible with USB 3 receptacle |
| USB-C |  | USB Type C | The latest addition to the USB family, this plug works similar a standard smartphone charger merely is horizontally symmetrical, meaning information technology can be put in 'upside downwards'. | Every bit it is the latest blazon, the USB-C shape is simply produced in USB 3.1 |
| USB-Mini B |  | USB-Mini B | These plugs were used for charging older mobile phones, cameras and MP3s but are largely redundant now. | USB Mini-B plugs piece of work with USB two.0 Mini-B and Mini-AB receptacles |
| USB-micro B |  | Micro-USB | The USB ii micro B is the standard plug shape found on all mod Android smartphones. | USB 2.0 micro B plugs can fit into USB 3 micro B receptacles but USB 3.0 micro B plugs cannot fit into USB 2 micro B receptacles |
| USB three.0 micro B |  | Micro-B SuperSpeed | The new USB 3 micro B is capable of transferring actress data. | USB 3.0 micro-B plugs will merely fit with either USB 3.0 micro-B receptacles or USB three.0 micro-AB receptacles |
Source: https://www.cmd-ltd.com/advice-centre/usb-chargers-and-power-modules/usb-and-power-module-product-help/usb-charger-faqs/
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