What You Need to Know about Selecting Power Adapters and Chargers for HP EliteBook Computers

A power adapter or charger converts the 120 to 240 volts of alternating current electrical power from a wall outlet into the 18 to 21 volts of direct current electricity that a computer needs in order to work or for its battery to get a charge. These devices both transform the electrical voltage and step it down, ensuring that the sensitive electronics are not exposed to too much electricity or the wrong type of current. There are many options and features to consider when selecting an adapter or charger to power your HP EliteBook computer.

What types of transformer or charger is available for HP laptops?

The available types of adapter or charger units available to power your laptop computer include:

  • AC/standard: This kind of adapter steps down the alternating current from the wall outlet and converts it into direct current for your HP computer.
  • AC/DC: This laptop AC adapter charger accepts either alternating current or direct current input and provides a direct current output to your HP computer.
  • DC or in-car: This type of laptop power adapter accepts direct current through a connection with your car's removable cigarette lighter or DC port. It receives direct current from the car's battery and works while the car's engine is running.
What is the output voltage for these laptop chargers?

Different computer batteries require different levels of voltage for charging or running the computer. The output voltage for these laptop battery chargers and electricity transformers is available in the following ranges for your HP:

  • 10 to 12 volts
  • 16, 16.5, 17, and 17.5 volts
  • 18.5, 19, 19.5, and 20 volts
  • 24 volts or more
What are the cord length options for AC adapter laptop chargers?

The available cable length options for the cord that connects the alternating current wall outlet to the transformer or charging box are 4 to 6 feet. The available cable lengths for the piece connecting the laptop to the electricity transformer are also 4 to 6 feet. The plugs are available as straight or 90-degree angled pins. The transformer box itself measures about 4 to 6 inches long by 1.5 to 2 inches wide by 1.5 to 2 inches deep. See the manufacturer site for details.

How do you select a compatible charger for HP laptops?

It is important to select a battery charging product that delivers the right amount of power to your computer. To verify that the charging unit is the correct type for your HP computer, you could look at the original unit that you are replacing and verify its power output and input capacities. You could also refer to the computer's owner's manual to get the correct model number for the right battery power charging unit.

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