Many of us have an electric charger that we use to charge our devices and laptops. But have you ever wondered how much power your charger uses to charge your laptop or any device? So, let’s discuss this in detail.

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## What is wattage?

Wattage is the unit of measurement of power. It measures the amount of power used by an electrical device. The wattage can be used to measure the output of electrical appliances. So, how does wattage work? If you have a 1000-watt bulb then it means that it will produce 1 unit of power for every second.

## What is power?

Power is the amount of energy that is used by an electrical appliance. It is measured in units of watts. The power is measured in watts. It measures the amount of energy that is being consumed by an electrical appliance.

## How to calculate the watts?

If you want to calculate the watts then you need to multiply the voltage with the current. The equation is as follows:

Voltage x Current = Watts

## How to convert the wattage to joules?

The amount of energy produced by an appliance can be converted to joules by using this formula:

Watts = Joules / 60

## How to calculate the volts?

To find out the volts, you need to divide the wattage by the resistance. The equation is as follows:

Watts / Resistance = Volts

## How to calculate the current?

To find out the current, you need to divide the wattage by the resistance. The equation is as follows:

Watts / Resistance = Current

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### Conclusion

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## Faqs:

### 1. What is the difference between watts and amps?

Watts and amps are measurements of electrical current. Amps measure the amount of current flowing through a circuit.

### 2. How long will it take to fully charge a laptop?

It depends on how fast the battery drains when you’re not using it. Some laptops have batteries that are designed to last longer than others, so you may have to charge your laptop for a little longer.

### 3. How many Watts Does A Laptop Use When Charging?

Most laptops require a wall adapter or portable charger with a minimum output of 2.1-amps. The amount of wattage varies by model and by the manufacturer. For example, a Dell Optiplex 745 laptop uses 14 watts while a Lenovo ThinkPad X300 uses 8 watts. A laptop may use anywhere from 2 watts to 30 watts, depending on its power needs. The power used by a laptop’s charging system is a function of its power usage.