UserUnknownFactor

USB Cable Resistance:
Why your phone/tablet might be charging slow

Tablets and smartphones are now ubiquitous, and almost universally, they rely on some form of USB connection to provide the power to charge the device. This is, in no doubt, because of a desire to reduce waste and meet EU regulations and has made it rather convenient for end users as cables and chargers are easy to find and are, to some degree, interchangeable. However, it does cause problems sometimes – namely slow or incomplete/inconsistent charging.

The Problem

When USB was conceived, the maximum current available was 500mA at 5V for a total of 2.5W. This is enough to power most smaller devices, but with smartphones and tablets, this is often only enough to power the device without any surplus left for charging.

	rem cmd
	rem git doesn't require any actual repository or its worktree to be in any particular place.

	git clone -c core.symlinks=true https://github.com/User/application
	mklink /d main\resources\ c:\src\main\resources\
	mklink file.xml c:\src\main\resources\file.xml

	git submodule init
	echo gitdir: C:\to\shared\libraryXYZ\.git > libraryXYZ\.git
	rem for example to see where all a project's submodules' parts are kept

	git rebase -i --root
	REM pick to edit :wq
	git commit -S --amend --no-edit && git rebase --continue
	REM git log --show-signature

	require 'zlib'

	# Some data structures that are common to both VX and VX Ace.

	class Rect
	def initialize(x, y, width, height)
	@x = x
	@y = y
	@width = width
	@height = height

	# coding: utf-8
	# Alternative version that doesn't use serialization/deserialization libraries
	# it modifies files directly instead.

	import argparse, sys, os, glob, re, struct, csv, hashlib, math, zlib
	from multiprocessing import Pool

	DUMP_ALL_STRINGS = False
	OUT_DIR = 'out'

	#include "KaresekaHook.h"
	#include "MyHook.h"
	#include "StreamHolderXP3.h"
	#include "IStreamExXP3.h"
	#include "tp_stub.h"
	#include <string>
	#include <vector>
	using std::wstring;

	#include <iostream>

	import itertools
	import sys
	import struct
	import zlib
	from io import open, BytesIO, SEEK_CUR, SEEK_END # noqa

	PY2 = sys.version_info[0] == 2

	# Kaitai Struct runtime streaming API version, defined as per PEP-0396
	# standard. Used for two purposes:

	#!/usr/bin/env python
	# -- coding: utf-8 --
	# unzip-enc.py

	import os, sys, argparse, locale, zipfile, codecs
	from charamel import Detector

	def setup_console(sys_enc="utf-8"):
	try:
	if sys.version_info >= (3, 4):

UserUnknownFactor

USB Cable Resistance:Why your phone/tablet might be charging slow

The Problem

USB Cable Resistance:
Why your phone/tablet might be charging slow