Say if I have a 60 watts light bulb, it means that it uses 60 watts of power per hour, right?? does that work the same as power supplies??
Power Consumption??
- Thread starter Springdalewater
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DrPizza
Administrator Elite Member Goat Whisperer
A watt is a joule per second
What 60 Watts means is that your lightbulb is consuming energy at a rate of 60 Joules per second.
The confusion with hours probably comes from the way you are charged for energy usage: by the kilowatt-hour
A kilowatt-hour is 1000joules/second*1200seconds or simply 1.2 Megajoules of energy.
Maybe what you mean is that it uses 60 watt-hours of energy?
edit: perhaps consuming is a bad word.
What 60 Watts means is that your lightbulb is consuming energy at a rate of 60 Joules per second.
The confusion with hours probably comes from the way you are charged for energy usage: by the kilowatt-hour
A kilowatt-hour is 1000joules/second*1200seconds or simply 1.2 Megajoules of energy.
Maybe what you mean is that it uses 60 watt-hours of energy?
edit: perhaps consuming is a bad word.
uhhhhhhh.........watts=volts*amp
I thought joules is work done, and the formula is joules=volts*columb??
amp=columb/t
Blah, physic sure is confusing.
I thought joules is work done, and the formula is joules=volts*columb??
amp=columb/t
Blah, physic sure is confusing.
Dr. Pizza is right. I've found the best way to look at units is to consider what they actually represent.
A Joule is a unit of energy. A Watt is a rate of energy transfer or performance of work - Joules per second. If you want the net amount of something over time, you take the rate and integrate it over the time you're considering (e.g. rate of work * time of work = total amount of energy transfered via work). This 'amount' has units equivalent to Joules, since it is a total rate of energy transferred. Joules are equivalent to kilowatt-hours, but kWh are used because things are typically rated in Watts and your average Joe doesn't really know how to do the manipulations in his head.
A power supply that is rated at X watts is going to consume at most X watts. A lightbulb rated at X watts will consume X watts. So no, it's not the same. The amount of power the PSU consumes depends on the amount of power various components are drawing from the PSU, which varies. A lightbulb cosumes constant power if its on.
Power supplies rated X watts will OUTPUT at most X watts. They'll consume quite a bit more.
Lightbulbs in turn consume their rated wattage, with comparably abysmal light output. Most of the energy comes back out as useless heat.
Lightbulbs in turn consume their rated wattage, with comparably abysmal light output. Most of the energy comes back out as useless heat.
60 Watts is almost 0.1 HP. So, your car is having 100HP per hour or 100HP per second?
The bulb consumes 60 Wh in an hour, of 1kWh in about 16 hours. Also, it produce close to 60J of heat every second, or 14 cal of heat every second. Or 204 BTU/hour, if you choose to express it so (your indoor A/C unit might have its cooling capacity in BTU/hour
The bulb consumes 60 Wh in an hour, of 1kWh in about 16 hours. Also, it produce close to 60J of heat every second, or 14 cal of heat every second. Or 204 BTU/hour, if you choose to express it so (your indoor A/C unit might have its cooling capacity in BTU/hour
Lot of confusion on power supplies here....
The PSU rating is their maximum output; in almost every case, they will be outputting (?) significantly less than their rating. They will be consuming (from the wall outlet) something like 10 to 25% more power than they are providing due to inefficiencies in the supply.
Thus, a 600 watt PSU providing 300 watts to a (very high end) system, will be consuming 330-375 watts from the wall outlet.
/frank
The PSU rating is their maximum output; in almost every case, they will be outputting (?) significantly less than their rating. They will be consuming (from the wall outlet) something like 10 to 25% more power than they are providing due to inefficiencies in the supply.
Thus, a 600 watt PSU providing 300 watts to a (very high end) system, will be consuming 330-375 watts from the wall outlet.
/frank
Point thoroughly missed. Watts is a unit of power, not of energy. There's no "per" in watts. If you use a 60W bulb for an hour, you've spent 60Wh of energy.
DrPizza
Administrator Elite Member Goat Whisperer
The lightbulb will consume 60 watts at any instant if energized at rated voltage. This is known as "demand" by the electric utility. If the bulb stays energized for 1 hour, this will be metered as 60Wh and will be included in your bill as such.
The watt rating on a power supply is the maximum power output while providing a stable voltage. From my direct measurements, most typical desktop computers consume ~150 to 250W (not including monitor of course).
I remember some IT guy at work was going to size a UPS for the server room based on the sum of the power supply ratings for every server in the room. The total was over 90KW; the UPS size actually required was 20KW (with a conservatism factor of 1.5 times base load). [KVA converted to KW for simplicity; UPS are rated in apparent power]
It might be helpful to look at it like this. "Watt" is a rate, just like miles per hour is a rate. Your car goes 60 miles an hour - how many miles does it go in one hour at this rate? 60. Exactly the same logic - how many Joules (the measure of energy, just as mile is the measure of distance) are expended if you run something at 60 Watts for one hour? Recalling that one Watt = one Joule per second, 60 Joules/second*60 seconds/minute*60 minutes/hour = 216000 Joules = 60 Watt-hours = 0.06 kiloWatt-hours.
... which is exactly why there is no "watts per second" - because "watts" already are "joule per second". Thanks
Useless? USELESS? Imagine the tens of millions of little girls (and boys) who would have been deprived endless hours of fun with their Easy-Bake Ovens if it were truely 'useless'.
:light:
Speaking of Power Consumption...My Video Card manufacturer says my PCIE card consumes up to 105W. But, can't PCIE only supply a maximum of 75W to the card?
Oh, you say, thats what the extra power connector is for. Well, there is no extra power connector on this card. So where's the extra power supposed to come from? Any ideas or enlightenment would be appreciated-(This sort of stuff just bugs me!)
Card's been working lately, but for awhile I got "insufficient power" warnings.
BFG6600GTOC, Antec Neo 480 (dual 12V rail-18A max to GPU, shared with lots other stuff)
Oh, you say, thats what the extra power connector is for. Well, there is no extra power connector on this card. So where's the extra power supposed to come from? Any ideas or enlightenment would be appreciated-(This sort of stuff just bugs me!)
Card's been working lately, but for awhile I got "insufficient power" warnings.
BFG6600GTOC, Antec Neo 480 (dual 12V rail-18A max to GPU, shared with lots other stuff)
DrPizza
Administrator Elite Member Goat Whisperer
Originally posted by: L00PY
Useless? USELESS? Imagine the tens of millions of little girls (and boys) who would have been deprived endless hours of fun with their Easy-Bake Ovens if it were truely 'useless'.
:light:
Also, For a decent hunk of the year (around here in the NE), the heat from the lightbulbs simply goes toward the heating needs of the house.
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