# What is the voltage of a laptop charger?

For mobile phones and other mobile devices like the Kindle that charge with USB, the voltage is typically 5V. A laptop charger might be as high as 20V or 25V. You can usually find the voltage your device needs on the device itself, on the battery, or if all else fails, on the manufacturer’s web site.

How many volts is a computer charger?

You could use a Lightning connector plugged into a computer (via USB), an iPhone charger connected to a wall socket, or an iPad charger connected to a wall socket. A PC USB charger delivers 2.5 Watts of power (5 volts at 500 mA). An iPhone charger delivers 5 Watts (5 volts at 1000 mA).

## Can you charge a battery with a higher voltage?

In practice that means a few volts higher than the battery normal output voltage. Thus for a 12V car battery the charger must put at least 14 volts or thereabouts across the battery. Added: you can use a 100V source to charge a lower voltage battery. You do it by what’s called ‘trickle’ charging.

## Is my laptop AC or DC?

Usually, adapter has circuit that converts AC mains voltage into DC & that acts as input to your laptop’s battery. So, adapter draws AC from supply, but battery charges on DC.

## Can you charge a cell phone with a laptop?

First you are right, if the laptop is on charger than charging the cellphone by USB port does not cycle current from the laptop battery. The current comes from the laptop charger and only slows down the rate at which the laptop will recharge. Second case, if the cell phone is charge from your laptop running on battery.

## Do the AMPS matter?

So the the volts must be correct for a product to work. Current is supplied by a power supply or charger. A product (e.g an iPhone/iPad) consumes current. If the power supply can supply more than 2.1Amps this doesn’t matter as the product will only take 2.1Amps.

## What is the voltage of a laptop battery?

My stock battery was a 6-cell 4000mah 11.1v and the new battery is an 8-cell 4800mah 14.8v . I know that 8-cell and 4800mah is okay, but what about the 14.8v instead of 11.1v? The battery description says it’s compatible with my laptop model (AS5100, model BL51), but the voltage difference makes me wonder.

## Can you use a 90w charger instead of a 45w?

If the output voltage is the same, you can use a 90W charger on a 45W laptop BUT cannot use a 45W charger on a 90W laptop. On the condition of same voltage, laptops and other devices will never overpowered. The amps you saw is the maximum one adapter is capable of, not the rated current.

## How many volts is a computer charger?

You could use a Lightning connector plugged into a computer (via USB), an iPhone charger connected to a wall socket, or an iPad charger connected to a wall socket. A PC USB charger delivers 2.5 Watts of power (5 volts at 500 mA). An iPhone charger delivers 5 Watts (5 volts at 1000 mA).

## What voltage do laptops run on?

Why do many laptops run on 19 volts? Typically mobile devices that have a mains-powered supply will accept voltage that is multiple of some single battery voltage. For example, 4.5 volts is 1.5 volts (AA primary battery) 3 times and 36 volts is 3.6 volts (Li-Ion battery) 10 times.

## How many amps does it take to run a laptop?

Most likely, all you will need is 5 amps. Look at your laptop power adapter (the black brick). On the backside it should tell you what the power draw is in amps. Most likely its 1 to 2 amps.

## How many amps does it take to charge a phone?

An iPhone charger delivers 5 Watts (5 volts at 1000 mA). A Retina iPad mini charger delivers 10 watts (5.1 volts at 2100 mA). While all of these will charge your iPad, using the USB connected to a PC will charge your Retina mini four times slower than if you used the iPad charger it came with.

## Can you charge a laptop through a USB port?

no. Here’s why: the USB ports on laptops function to dispense power to other devices and peripherals, which is why you can charge your iPad, iPod, and other devices by simply plugging them in. This means that any battery pack or power solution meant for your laptop needs to be plugged into the power port.

## What is a power adapter for a laptop?

Alternatively known as an AC/DC adapter, AC converter or charger, an AC adapter is an external power supply used with devices that run on batteries or have no other power source. AC adapters help reduce the size of a laptop computer by alleviating the need for a standard sized power supply.

## Can you use a 12v adapter for a 15v device?

Assuming the polarity is correct, plugging in a 12V input to a device requiring 15V won’t do any damage, however if you undervolt an amplifier, you may get clipping or other distortion. I’d try Amazon for an adapter that has 15V output, possibly a universal type.

## What is a DC IN 5v?

Fosmon’s US AC (100-240V) to DC (5V / 1A) Power Supply Adapter is a convenient, universal power adapter that can be used to charge or supply power to many different electronic devices.

## What does it mean by switching power supply?

A switch-mode power supply (switching-mode power supply or SMPS) is an electronic power supply that uses a switching regulator in order to control the conversion of electrical power in a highly efficient manner. This higher efficiency (thus lower heat dissipation) is the chief advantage of a switched-mode power supply.

## Are all micro USB phone chargers the same?

All USB cords carry the same 5V, regardless of if it’s got a 30-pin head or a microUSB plug, whether it’s first-party or third. That means DC chargers are now brand agnostic; if the volts, amps, and connectors are compatible, an Apple wall wart can charge an HTC just as easily as a Samsung.

## Which wire is positive on DC adapter?

The solid/dashed lines on wires like the ones pictured in your question are used to indicate polarity e.g. for the “wall wart” power supplies. Usually* the wire with the white stripe or the dashed lines carries the “positive” (+) end, while the other, unmarked wire carries the “negative” (-) end.

## How many watts is a laptop power supply?

On the bottom of the laptop it should say how many volts and amps it needs ie it may say 18.5V 4.9A if you multiply these together you get 90.65 which is the watts. You should get a power supply that has the correct voltage and at least the correct Amps/Watts.

## What is the voltage required to charge a mobile?

1 – Yes, your understanding is correct. 2 – The minimum voltage required to charge a 3.7v Li-Ion battery (to 3.7v), is 3.7v. A more practical voltage would be, 4.0v (3.7 < 4.0 < 4.2). A more “realistic” example of the second part of the first sentence would be 10 hours at 100mA.

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