|» Choosing the right AC/DC adapter
| Before you buy any AC/DC laptop adapter,
please make sure the AC/DC laptop adapter will give you
the correct voltage...
|» Information for AC laptop adapter.
| AC Power Adapter can provide continuous
power to your laptop/notebook computer and charge the
laptop battery from AC..
|» Information for Car (Auto) DC laptop adapter.
| Our Car (Auto) DC Power Adapter is the
compact, portable power solution for mobile users on the
road, the DC power...
|» What is Alternating Current?
| In electricity, alternating current
(AC) occurs when charge carriers in a conductor or semiconductor
|» What is Direct Current?
| DC (Direct current) is the unidirectional
flow or movement of electric charge carriers, usually
|Choosing the right AC/DC adapter
Before you buy any AC/DC
laptop adapter, please make sure the AC/DC laptop adapter will give you
the correct voltage and suitable current output.
To find out the
voltage & current, turn your laptop over and look for a label,
sticker or writing which shows the voltage and current, it should look
something like the examples below. The voltage figure will have a "V"
after the number i.e 19V and the current will have a "A" or "mA". i.e
3.15A, 950mA. You can also find these shown in a similar fashion on the
original AC adapter if you have it. In the examples below the voltage
& current has been marked with a red ring.
|Information for AC laptop adapter.
|AC Power Adapter can provide continuous power to your
laptop/notebook computer and charge the laptop battery
from AC power source such as electrical plugs on the wall.
If you are looking for a power adapter which can power
your laptop and charge the laptop battery from Car, you
need looking for our Car (Auto) DC power adapter.
|Information for Car (Auto) DC laptop adapter.
|Our Car (Auto) DC Power Adapter is the compact, portable
power solution for mobile users on the road, the DC power
adapter can be used on vehicles with standard cigarette
lighters (such as cars and boats) to provide continuous
power to your laptop/notebook computers and recharge your
|What is Alternating Current?
alternating current (AC) occurs when charge carriers in a conductor or
semiconductor periodically reverse their direction of movement.
Household utility current in most countries is AC with a frequency of
60 hertz (60 complete cycles per second), although in some countries it
is 50 Hz. The radio-frequency (RF) current in antennas and transmission
lines is another example of AC.
More information on Alternating Current (AC):
AC waveform can be sinusoidal, square, or sawtooth-shaped. Some AC
waveforms are irregular or complicated. An example of sine-wave AC is
common household utility current (in the ideal case). Square or
sawtooth waves are produced by certain types of electronic oscillators,
and by a low-end uninterruptible power supply (UPS) when it is
operating from its battery. Irregular AC waves are produced by audio
amplifiers that deal with analog voice signals and/or music.
voltage of an AC power source can be easily changed by means of a power
transformer. This allows the voltage to be stepped up (increased) for
transmission and distribution. High-voltage transmission is more
efficient than low-voltage transmission over long distances, because
the loss caused by conductor resistance decreases as the voltage
The voltage of an AC power source changes from instant
to instant in time. The effective voltage of an AC utility power source
is usually considered to be the DC voltage that would produce the same
power dissipation as heat assuming a pure resistance. The effective
voltage for a sine wave is not the same as the peak voltage. To obtain
effective voltage from peak voltage, multiply by 0.707. To obtain peak
voltage from effective voltage, multiply by 1.414.
|What is Direct Current?
DC (Direct current) is
the unidirectional flow or movement of electric charge carriers,
usually electron. The intensity of the current can vary with time, but
the general direction of movement stays the same at all times. As an
adjective, the term DC is used in reference to voltage whose polarity
In a DC circuit, electrons emerge from the
negative, or minus, pole and move towards the positive, or plus, pole.
Nevertheless, physicists define DC as traveling from plus to minus.
More information on Direct Current (DC):
current is produced by electrochemical and photovoltaic cells and
batteries. In contrast, the electricity available from utility mains in
most countries is AC (alternating current). Utility AC can be converted
to DC by means of a power supply consisting of a transformer, a
rectifier (which prevents the flow of current from reversing), and a
filter (which eliminates current pulsations in the output of the
Virtually all electronic, digital device and computer
hardware needs DC to function. Most solid-state equipment requires
between 1.5 and 13.5 volts. Current demands can range from practically
zero for an electronic wristwatch to more than 100 amperes for a radio
communications power amplifier. Equipment using vacuum tubes, such as a
high-power radio or television broadcast transmitter or a CRT
(cathode-ray tube) display, require from about 150 volts to several
thousand volts DC.