# 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.

How many amps does a smartphone need to charge?

Basic feature or flip phones use around 0.5 amps to charge at a standard rate, while the majority of smartphones, including the iPhone, use up to 1 amp for a standard charge. Most tablets require 2.1 amps to charge at a standard rate.

2.1 amps

## 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.

## How much voltage is needed to charge a mobile phone?

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 much current is required to charge a cell phone?

There is no minimum amount of current required to charge a battery even with 1 mA one can charge but it will takes long time for example a 2000 mAh battery would take around 84 days to charge battery completely with 1 mA charge Current but we require fast charging for our daily requirement so now a days smart phones

## How long does it take to charge a 3.7 Lipo battery?

If you have a 1000mAh battery, charging at 1000mA will fully charge that battery in 1 hour. Charging it at 500mA will mean a full charge takes twice as long – 2 hours. So more charge current is better…as long as it doesn’t exceed your battery’s specifications.

## Can I plug my iphone into 220 volts?

Apple’s iPhone power adapter takes AC input that is between 100 Volt (The U.S. is typically 110 Volt) and 240 (Europe is typically 220 Volt) and lets out a nice regular stream of 5 or 10-volt power for the iPhone. So as long as you have a plug adapter, Apple has you covered for the voltage.

## What is the voltage of a cell phone battery?

Depending on the design and chemistry of your lithium cell, you may see them sold under different nominal “voltages”. For example, almost all lithium polymer batteries are 3.7V or 4.2V batteries.

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

It depends on how fast you charge it. If you are using usb some ports can charge faster than others. I think you can get as much as 2 amps at 5 volts which is 10 watts from a wall powered charger and up to 1.5 amps from usb which is 7.5 watts.

## How much does it cost to charge a mobile phone?

If you fully drained and recharged your phone everyday, then over the course of a year you would have to feed it about 2,000 watt hours, or 2kWh. At an average price of 12 cents that means that your phone uses about one quarter’s worth of electricity per year.

## 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.

## Can you use an IPAD charger to charge an Iphone?

You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products. Just connect your device to the power adapter with the Lightning to USB Cable, 30-pin to USB cable, or Apple Watch charger that came with your device.

## Can you charge an Iphone with a Samsung charger?

of course we can use Samsung adapter and Apple cable. the adapter only supplies power, it is only controlling the rate of charge or completion of charge. you must use an Apple cable that is certified as Made for iPhone. However, the USB power adapter can be any quality adapter that can supply at least 1 amp.

## How many volts does it take to light a LED?

Based on what you describe seems like you have something lower than 3 volts (since it does turn with 1 battery). You can see in the following image I have a 3 volt-drop LED, if I power it with a 6V battery I have both LEDs light up. As I measure the voltage between the LEDs I read 3 Volts, as expected.

## How many volts are in a cell phone 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).

## How many watts are in a Volt?

Using Ohms law, you would multiply amperage times volts to get watts. For instance a 12 volt circuit drawing 2 amps would consume 24 watts of power (12*2=24). A 60 watt light bulb powered by 120 volts in a house would draw .5 amp of current (60/120= .5).

## Are all USB chargers the same power?

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.

## 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.

## How many watts are used to charge a cell phone?

Cell phones, mobile phones, even smart phones and tablets are very energy efficient because they are designed to run on a battery for a long period of time. Cell Phones use approximately 2 to 6 watts when charging, while a charger left plugged in without a phone will consume 0.1 to 0.5 of a watt.

5 Volts

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