Using
USB Chargers Safely(2)
Types of
USB ports
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There
are three types of USB port dictated by the actual current specs (milliamps or
Ma).
Dedicated
charging port
A
dedicated charging port applies to power sources like wall chargers that do not
enumerate, so charging occurs with no digital communication at all.
Downstream
port
A
charging downstream port can be found on a computer or laptop and can supply up
to 1.5A, whilst allowing a USB to be detected and begin charging before
enumeration (which is when the digital communication takes place).
Standard
downstream port
A
standard downstream port can be found on a computer or laptop and needs to
enumerate (start digital communication) to be USB compliant, however most
present-day hardware does draw power without enumerating.
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Voltage
and Amperage
Not
all USB connectors, cables and chargers are equal. For example, some wall
chargers can supply more power than others and one particular USB socket on a
laptop may vary in power from the others, or PCs with some able to charge
whilst in sleep mode.
You
will also need to consider Amperage.Chargers increase the current to provide a
higher amount of power quickly – this is measured in amps and the more amps
means the more power. Therefore, a charger that comes with a smartphone will
provide less amps than a charger that come with a tablet. You will need to
consider voltage and the equipment you’ll need to use to enable the use of USB
chargers when travelling internationally.
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Safety
Concerns
Uncertified
chargers come with serious safety concerns. Similar to unofficial batteries,
uncertified chargers can be bought at a reduced price online, from overseas or
in high street shops and these kind of electrical products may present a higher
risk of exploding or catching fire. Not only do they present a risk to you, the
use of uncertified chargers may also damage your phone (which in turn could
void your guarantee).
Cheap
devices often fail to meet the requirements of the Electrical Equipment
Regulations Act 1994. The money that you save comes with extremely high risks
and therefore buying a branded/certified charger is essential to avoid often
fatal repercussions.
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