How much electricity does a computer use 

How much electricity does a computer use 

In this article, we explained how much electricity a computer uses, including detailed calculations to determine the annual cost and electricity consumption.

A desktop computer consumes 219 Watts of electricity per hour on average, while a 15-inch laptop consumes 159 Watts. We have provided detailed calculations to arrive at the total amount of electricity consumed and the cost.

Electricity consumption of Desktop Computer

When active, the CPU and desktop monitor consume approximately 170 Watts of electricity per hour. The power consumption drops to 80 Watts per hour when in standby or sleep mode.

Other devices that consume power are used in conjunction with a desktop computer. This must be factored into our calculations. Among the other devices are:

  • Speakers that use up to 20 Watts per hour
  • Printer and scanner with a power consumption of up to 7 Watts per hour
  • Internet modem with a power consumption of up to 10 watts per hour
  • Paper shredder with a power consumption of up to 12 watts per hour

If you want to keep your desktop cool and avoid overheating, you can include the power consumption of a medium air conditioner. A medium-sized air conditioner can use up to 1000 watts per hour. We will not include it in our calculation because it is not a computer component.

Assume you use your desktop computer actively for 9 hours per day and leave it in standby mode for 4 hours per day. This brings our daily energy consumption to 2072 watts.

If you use your computer every day, your total annual power consumption will be 765 KW. Ideally, the total will be slightly lower if you do not use your computer on a daily or weekend basis.

Electricity consumption of Laptop

A laptop uses far less power than a desktop computer. When in active use, the laptop consumes 70 Watts of electricity per hour. When in standby or sleep mode, the laptop’s power consumption drops to 25 Watts per hour.

We’ll look at the same external factors:

  • Wireless mouse that consumes up to 5 Watts per hour
  • A second monitor that consumes up to 35 Watts per hour
  • Speakers that use up to 20 Watts per hour
  • Printer and scanner with a power consumption of up to 7 Watts per hour
  • Internet modem with a power consumption of up to 10 watts per hour
  • Paper shredder with a power consumption of up to 12 watts per hour

Assume you use your laptop actively for 9 hours per day and leave it in standby mode for 4 hours per day. This brings our daily energy consumption to 1372 watts.

What Is The Power Consumption Of Desktop Computers

Desktop computer power consumption ranges from 5 to 250 Watts for PCs without monitors (there are models outside of this range, but this is an average). Workstations could use more energy. Desktop monitors typically consume 20 Watts (not including CRT or LED-backlit models).

The maximum wattage on a computer’s power supply unit (PSU) is typically well over 300 Watts (and over 1,000 Watts in the case of some high-performance models). Some low-profile and small form factor (SFF) office PCs require 180W to 240W.

This wattage rating, however, refers to the PSU’s peak power output rather than its power consumption. The power consumption of computers varies greatly due to two key factors: usage and the components that comprise them.

Energy Calculator

Kampala has an energy usage calculator that you can use to calculate a computer’s energy usage as well as the monthly power cost. It can also calculate your MPG and fuel requirements for a trip. If you don’t want to download the app, you can use the browser-based calculator instead.

If you use an SSD, your computer will use less power; however, if you use a high-end video card, such as an AMD RX Vega model, rather than a low-end one, your computer will use more power. Your computer will use less power if it has an Intel i5 CPU rather than an i9. This is why this page breaks down power consumption by computer component.

The size of the monitor has a significant impact on its power consumption (i.e. larger monitors consume more power). Newer LED-backlit monitors, on the other hand, use far less energy than their older CFL-backlit counterparts.

LED-backlit monitors should not be confused with OLED displays. The LED-backlit monitors I mentioned earlier are LCD monitors. OLED displays do not use LCD technology.

Hard Drive Power Consumption

conventional Hard Disk Drive Power consumption ranges from 5 to 6.8 watts.

Power Consumption of a Solid-State Drive (SSD): 1.6 to 4.1 Watts. SSD energy consumption varies more than traditional hard drive power consumption because SSDs use far less energy when idle (due to the lack of a power-hungry spindle motor).

Conclusion

A desktop consumes 765 KW of electricity per year, costing $91.
A laptop consumes 500 KW of electricity annually, which costs $60.
A laptop consumes 35% more electricity than a desktop computer. The exact power consumption depends on the computer model, but the range will remain close as vendors strive to optimize power consumption.

Assume you own a company with 100 employees and provide each with a dedicated laptop. Then you will spend $6000 per year on electricity to run the laptops, which consume 50 Mega Watts of electricity.

With this OpenGenus article, you should have a good understanding of how to calculate a computer’s electricity consumption.

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