How Many Amps Does a Computer Monitor Use? Unraveling the Mystery

How Many Amps Does a Computer Monitor Use?

If you are using a computer for quite a few years then you are also paying for its electricity bills for a long time. So it is very natural that a question can pop up in your mind, “How many amps does a computer use?”

As while using a computer you are seeing all the outputs on the monitor and besides this may be you are also using your monitor for other purposes too so you might also be curious about, “How many amps does a computer monitor use?”

In this article, we are going to answer these questions and we will also discuss what you can do to lower your monitor’s power consumption to save you money.

Amps, Watts, and Volts: Understanding the Basics

Let’s start by going over some fundamental electrical terminologies before we get into the power usage of computer monitors.

Amps: Electrical current is measured in amperes, also known as amps. It calculates the rate at which electrons move through a conductor.

Volts: Volts are the unit of electrical potential difference. It measures the pressure driving electrons through a circuit.

Watts: Watts is the unit of electrical power. It calculates the rate of transfer of electrical energy. If we multiply volts and amps then we will get watts.

We must therefore know the wattage and voltage needs of the computer monitor in order to provide an accurate answer to the query of how many amps it uses.

How Many Watts or Amps Does a Computer Monitor Use?

Though the rate of power consumption varies with the size and model of the monitors but the majority of the monitors consume from 20 to 30 watts of power. If we convert it into amperes then it will be around 0.17-0.25 amps. Sometimes voltage spikes happen which can damage the monitor. In order to keep your monitor safe a voltage suppressor with the ability to hold at least 6 to 8 amps is needed for a standard 120-volt power outlet.

Among Watts and Amps, you just need to know the value of one in order to calculate the other provided you know the value of the voltage. You can calculate it by using the formula P=VI where P stands for Power, V stands for Voltage and I stands for Current.

Suppose your monitor consumes 20 watts of power and the voltage is 120 Volts. Then the amount of current the monitor consumes is 20 divided by 120 which is 0.17 amps. Similarly, you can calculate the power (watts) by multiplying the amps by the voltage which is stated in the formula P=VI.

It is always wise to check your monitor’s requirements for power before purchasing it. If you operate a monitor with high power requirement then it will increase your electricity bill. A lot of factor affects a monitor’s power consumption.

In order to know your monitor’s power requirements you can simply check the specifications segment of your monitor’s manual that the manufacturers always gives with the monitor. You can also search on the internet or go to the manufacturer’s website for such type of information.

One thing to keep in mind is that monitor will consume its stated maximum power only for a small period of time in situations like when it is just turned on or displaying a very bright picture. In most situations, the power demand will be low. That’s why using a voltage suppressor with a lot of extra amperages is not needed to handle those short-time peaks.

How Many Amps Does a Computer Use?

There are different types of computers now and their amount of power consumption is also different from each other. Here we will discuss the power consumption of the three main types of computers mainly desktops, laptops, and gaming computers.


A desktop computer powers comparatively more peripherals including a monitor, printer, speaker, etc. The more devices a computer powers the more energy it will consume. That’s why a desktop computer consumes a substantial amount of electricity.

Generally, a desktop PC needs from 0.25 amps to 2 amps of current per hour. If the number of peripherals is more then it will need even more amps. For instance, an average workstation needs between 2 and 3.5 amps of current every hour. If deployed for heavy utilizations then some computers even consume as high as 5 amps of current.


Laptops consume less amount of power compared to desktop and gaming PCs. But still, a laptop can do everything that a desktop can do. Now there are gaming laptops available too in the market.

A typical laptop consumes from 0.41 amps to 0.84 amps per hour. As a result, a laptop computer has a daily average power consumption of 6.73 amps for approximately eight hours of use.

However, if you connect any peripheral to your laptop then the power consumption will increase.

Gaming Computer

It is very normal that a gaming computer will consume more power than a conventional computer. Though a gaming laptop consumes less power than a gaming PC but overall they consume substantially more than the traditional ones.

Generally, a gaming PC PSU uses up to 6.25 amps of electricity per hour. The component which is the key contributor to this power consumption of gaming PC is its graphics card. The graphics card has a heavy duty and that’s why it needs a huge amount of power to function properly. A more powerful graphics card demands more electricity.

Power Consumption of Different Types of Monitors

There are different types of monitors and due to their different mechanisms, their power consumption also varies. You may see that two monitors are of the same size but as they are of different types their power consumption is different.

CRT Monitors

CRT monitors, also known as Cathode Ray Tube monitors, were the dominant type of computer display technology for many decades before being largely replaced by LCD and LED monitors.

A cathode ray tube is used in this monitor. This is also sometimes referred to as a picture tube. This cathode-ray tube is built with a vacuum tube, circuitry, heaters, deflection, electron guns, and a glass screen.

CRT monitors were vulnerable to flickering, it might strain the eyes and give individuals headaches, especially those who worked on computers for extended periods of time.

They are big in size and heavy and also consume a lot of power to function. For a normal 19-inch display, a CRT monitor consumes roughly 100 watts of power.

LCD Monitors

LCD (Liquid Crystal Display) monitors are a popular type of display technology used in computer monitors, televisions, and other electronic devices. LCD monitors are thinner, lighter, and more energy-efficient than traditional CRT monitors.

Monochrome pixels are used on LCD monitor panels. These monitors’ pixels are organized systematically. Digital technology used in LCD monitors creates shapes on flat surfaces using an array of crystals.

LCD displays come in a variety of designs, including TN (Twisted Nematic), IPS (In-Plane Switching), and VA (Vertical Alignment) panels.

The most popular type of panel is the TN panel, which is well-recognized for its quick response times and low price. For a normal 19-inch panel, an LCD monitor uses roughly 22 watts of power.

LED Monitors

LED stands for Light Emitting Diode. LED monitors have become the modern standard for display technology, offering a multitude of benefits over their predecessors.

This screen has a flat panel or a display that is merely curved, both of which run on light-emitting diodes. Unlike LCD monitors, it doesn’t utilize cold cathode fluorescent lighting (CCFL).

The advantage of LED monitors is that they last longer than LCD and CRT ones. They also consume significantly less electricity than CRT and LCD monitors. For a normal 19-inch panel, an LED monitor uses around 20 watts of power.

OLED Monitors

OLED stands for Organic Light Emitting Diode. OLED monitors are flat-panel displays that use organic materials to emit light and create images.

In comparison to traditional LCD screens, OLED displays have faster pixel response times and greater contrast ratios.

LED backlighting is not used in OLED technology. Instead, every pixel lights independently and serves as a separate source of light.

The problem with OLED monitors is that they are very expensive and that’s why they didn’t get that much a popularity. A standard 19-inch OLED monitor consumes roughly 21 watts of power.

Factors Affecting the Power Consumption of Monitor

There are many factors that contribute to the overall power consumption of a monitor. They are discussed below:

Screen Size

The amount of power consumed by monitors is significantly influenced by screen size. More energy is needed to power a larger monitor. A 32-inch monitor, for instance, consumes more electricity than a 24-inch monitor. So, if you want to save energy costs, think about getting a smaller display.

Display Type

Your monitor’s display type can have an effect on how much electricity it uses. A typical LCD display uses more energy than an LED monitor. LED monitors are a more environmentally friendly choice than LCD monitors because they can consume up to 50% less energy.


The brightness of your display also has an impact on how much power it uses. The higher the brightness level, the more energy your monitor will use. Lowering the brightness of your monitor can cut down on electricity usage significantly.

Refresh Rate

The number of times per second your monitor refreshes the image on the screen is known as its refresh rate. More energy is needed to power the monitor at higher refresh rates. Reduce the refresh rate of your monitor to save energy if you’re not using it for video editing or gaming.

Tips for Reducing the Power Consumption of Monitor

Reducing your monitor’s power consumption doesn’t mean sacrificing performance. The following recommendations will help you lower monitor power consumption without sacrificing functionality:

Adjust Brightness

Your monitor’s energy consumption can be considerably decreased by lowering the brightness level. Through the on-screen display menu, you can usually access the brightness control setting on monitors.

Use Power-Saving Mode

Activating the power-saving mode on your monitor can cut down on electrical power consumption by up to 90%. The majority of monitors contain a sleep mode option that, after a predetermined amount of inactivity, turns the screen off automatically.

Switching off Your Monitor When Not in Use

When you’re not using your monitor, switch it off completely. You can save a lot of energy this way, which will lower your electricity costs. You can use a power strip to switch off numerous devices simultaneously if you’re concerned about wear and tear on the power button on your display.

Upgrade to an LED Monitor

Consider switching to an LED monitor if you currently use an outdated LCD monitor. LED monitors are a more environmentally friendly choice than LCD monitors because they use up to 50% less energy. Additionally, LED monitors provide superior picture quality and have a greater lifespan.

Adjust Screen Resolution

The power consumption of your monitor can be decreased by lowering the screen resolution. The higher the resolution, the more energy your monitor will use. You may cut down on power usage while maintaining appropriate image quality by lowering the screen resolution.


I think now you have got the answer to the question “How many amps does a computer monitor use?” You can see that it depends on many factors. We have gone through detail on each of those factors.

It is important to know how many amps a computer monitor use before purchasing a monitor because if you purchase a monitor that consumes a huge amount of power then it will increase your electricity bill.

Keep in mind that, if you really need a monitor of big size or high configurations for heavy-duty then it’s totally understandable for you to buy a high-power requirement monitor. But if you don’t have such requirements then a monitor with low-power requirements is suitable.


Q. Can a monitor use too much power and damage my computer?

No, a monitor cannot draw too much electricity and harm your computer. However, it can raise your electricity cost and put more stress on your power supply.

Q. Does a monitor with higher resolution require more amps?

In general, displays with greater resolutions need more power, which translates to more amperage. This is due to the fact that higher-resolution monitors need more energy because there are more pixels to power and process.

Q. Can I use a power strip for my monitor?

Yes, you can use a power strip for your monitor. However, make sure the power strip can handle the current your monitor requires.

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