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Question

Does powerusage fluctuate ? etc...

Hey everyone,

I'm doing research on power usage by desktop,laptops,... and I got some questions.

Some desktops work with adapters (just as notebooks do) and it got me wondering...is the power stated on the adapter the maximum that the device can consume? I.e. adapter says 200W, does that mean that this device can consume a maximum of 200W ? Also is power usage constant? Logically one would say that a low burden on a device will also lower the power usage but is this in fact true?
And do the answers to the previous questions apply for devices without an adapter?

Thanks in advance

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All Answers

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Answer
Re: adapter

In reply to: Does powerusage fluctuate ? etc...

I'd so some practical research to answer those questions. There are nice inexpensive power meters that show exactly how much Watt a device connected trough it consumes. Most even let you enter the price per kWh, and show how much using it for one hour costs.

Much better than theory.

Kees

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Answer
It depends

In reply to: Does powerusage fluctuate ? etc...

The only "desktop looking" laptop PC is an AIO type that usually has a touch screen, etc.. While these do use an adapter they more a cross between laptop and desktop. More of laptop that never leaves the desk as they share the much of laptop components. Typical std. desktops use a non-adapter setup called a PSU.

To directly answer your ?, wattage use by a PC determines its overall power consumption. The more devices installed and then accessed tells of the wattage used. This in turn will go up/down as demands are gauged. The PSU or power supply will then go up/down to supply that power which is supplied by a "switching power supply" that provides the various voltages and wattage level required. The specs located on the decal/sticker provide the MAX/MIN tolerance level it can provide up to a given time period, it is NOT meant to be a "constant" output but can be addressed should it be needed.

http://www.sparklepower.com/ <---good PSU link

tada -----Willy Happy

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Answer
Nod to a Watt meter.

In reply to: Does powerusage fluctuate ? etc...

For about 20 bucks I picked up a P3 Watt meter so over the years I have measured a lot of systems.

1. Never found any system reach the maximum draw on the label.
2. Yes, power draw varies with what the computer is doing.
Bob

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