Electricity Question

[Sysman]

TV's on standby, chargers plugged in (but no attached device), fridges purring, plugged in microwave ovens... all take a small amount of charge. Fortunately modern devices take less than the older stuff.

However, 6 LCD screens, 4 Dell servers, x1 I7 CPU Games Machine and x1 Dell workstation make that spinney leccy meter wheel spin so fast you could cut the finest Canadian timber with ease.

Kettles, lights, irons and tumble dryers take a massive hit though.

Way back in the 80s I moved from a flat which only had an immersion heater for hot water, plus an electric cooker to a house with gas everything, yet the leccy bill doubled. When someone suggested the shiny new tumble dryer I stopped using it as a test, but the bills were still higher than the old pad.

The number of lights I had switched on were the culprit. It was a much larger house with an open plan layout, so I'd have a lot more lights on than the old pad, just cos it looked nice. It looked nice from the outside too when lit up, so I'd been leaving them on when I just nipped to the pub for last orders.

It all added up.

[Doggy Styles]

If a device is disconnected from an electricity supply it cannot be using any electricity from it. That is a fact.

If any device is still drawing current it is obviously still connected.

As others have said, the on/off switch on a device is not always designed to fully disconnect it.

[escapeUK]

All these little reductions make little difference anyway, save 5% while the provider puts the price up 25% every year.

[VectraMan]

That must rank as the wrongest wrong thing ever posted on this site.
It's so wrong, I dont even know where to start to rant on about its wrongness

Except for the being right part.

My Dell desktop uses about 1W when "off". Most PCs support stuff like wake on LAN, even though hardly anybody uses it, so most are sitting around with part of the power supply and part of the motherboard still powered even when "off". But I found most of the wasted power from my PC was because I always leave the speakers on.

[doodab]

If the switch is on the inlet side of the psu and breaks the connection to the mains it won't use any electricity.

Most switches on consumer electronics aren't so most things use a bit. Standby use can vary from milliwatts to 20W or more. I've a dvd recorder that uses more power on standby that my htpc, tv, playstation, modem and wireless access point put together.

The best way to find out is to get a plugin power meter, they are £10 or £20 or so from maplins.

[hyperD]

TV's on standby, chargers plugged in (but no attached device), fridges purring, plugged in microwave ovens... all take a small amount of charge. Fortunately modern devices take less than the older stuff.

However, 6 LCD screens, 4 Dell servers, x1 I7 CPU Games Machine and x1 Dell workstation make that spinney leccy meter wheel spin so fast you could cut the finest Canadian timber with ease.

Kettles, lights, irons and tumble dryers take a massive hit though.

[TimberWolf]

Anyone measured their PC's power consumption when it's in hibernate/sleep mode? And what about peripherals, printer, screen, modem, etc. I imagine the modem/router add up to quite a bit as most people don't sleep or turn those off.

As for TV, etc on standby, I doubt it adds up to much and what is consumed heats the house a teensy bit at 100% efficiency.

[Troll]

That must rank as the wrongest wrong thing ever posted on this site.
It's so wrong, I dont even know where to start to rant on about its wrongness

wrong

So if it's so wrong does that make it right?

[EternalOptimist]

Cobblers. If something is switched off, i.e. by a switch, it's using no electricity whatsoever.

That must rank as the wrongest wrong thing ever posted on this site.
It's so wrong, I dont even know where to start to rant on about its wrongness

wrong

[Sysman]

Cobblers. If something is switched off, i.e. by a switch, it's using no electricity whatsoever.

Modern PCs also use a small amount of power all the time.

I know a chap who has a collection of old servers and when he did the measurements he was surprised how much they consumed when turned off by the switch on the computer. He installed switched power strips so that he can turn them off properly, and has made a good saving on his leccy bill.

I assume that since servers are designed to run full time, the manufacturers don't put any effort into ensuring low consumption when they are switched off.

[VectraMan]

Cobblers. If something is switched off, i.e. by a switch, it's using no electricity whatsoever.

The issue is what does "off" really mean? If your TV is on standby, it's not really off, it's still using some power to keep the IR receiver circuitry active. A microwave with a clock is again not really off, but using power to display the clock. And phone charges and the like also don't have switches so will always be wasting a small amount of power. Modern PCs also use a small amount of power all the time. At the extreme end, Sky+ uses pretty much the same amount of power when "off" as it does when "on".

But something like a kettle with a physical on off switch is using zero electricity when off.

I've got one of those measuring plugs, and one interesting thing is that my CD player was using 5W on standby, but my 10 year old Pioneer stereo amp was using zero (i.e. less than it could read). It's because being a higher power device is has big relays that make a clunk when it switches on, so standby has to do nothing more than keep the infra-red receiver active. Which just shows how moronically simple it would be for manufacturers to solve this problem. My Sony LCD TV claims to be "green" because it has a motion sensor and switches itself "off" after 10 minutes of nobody being in the room, yet it still wastes 10W on standby. A simple relay circuit could reduce that to virtually zero, and still be able to wake itself up from the remote.

[escapeUK]

Now this may be an obvious question, but if an electrical appliance is plugged in to the socket and not turned on but the socket switch is, does this actually use electricity, ie will it increase my meter reading ?

Generally no, but some do. I borrowed one of those plugs that tells you how much electricity something is using, and was surprised to see my kettle was using some even while not heating water. I think some chargers are guilty of it too.

Might be worth while borrowing one of those plugs.

http://www.amazon.co.uk/Plug-In-Powe...1384345&sr=8-1

Came in useful when I was collocating a server too!

There's also a device called an Owl which constantly tells you what everything is using (as a total) in your home.

[mos]

Now this may be an obvious question, but if an electrical appliance is plugged in to the socket and not turned on but the socket switch is, does this actually use electricity, ie will it increase my meter reading ?

Yes for certain appliances according to these guys ... (consumption figures based on 1999 standards)
Energy Myth: Appliances Use No Energy When Turned Off

[kaiser78]

Now this may be an obvious question, but if an electrical appliance is plugged in to the socket and not turned on but the socket switch is, does this actually use electricity, ie will it increase my meter reading ?