How much will my monthy electicity bill increase by if I run a small fan 24/7?
360016
There are 24 x 31 = 744 hours in a 31 day month.  Check your fan name tag for the rated watts (single speed?).  Multiply the watts times 744 and divide by 1,000 to get KW-Hr (kilowatt-hours) of power per month.  Check your power bill for the charge per KW-Hr.  It should be about 10 to 15 cents per KW-Hr (or KWH), depending upon where you live.  For example if a small fan draws say 20 watts, the calculation would be:\n\n(20 x 744)/1,000 = 14.88 KW-Hr @ $0.10 per KW-Hr = $1.49 per month or about $17.85 per year.\n\nGood luck.
171777
I think it's worth it - a surge protector or even a UPS. Sometimes you can get deals on free power strips with surge protection. A UPS will only cost $30-$50 bucks at most, I think.
699167
1. when produced by a generator it is nearly 1\n2. but when it arrives at the use point it can drop to  0.5 if we have a lot of inductive load like motors, transformers etc\n3. In general the lower limit is 0.8 and the power supply companies charge you a penalty for dropping below 0.9 PF\n4, In order to improve your power factor you have to put in capacitor banks to offset the inductive load in your use area.
263201
I am an electronics student and this has camu in class one time. It is usually safe to turn it iff every night if you want, and it will take longer for the fan and power supply to burn out. But whenever you turn the computer on there is a higher than normal surge of electricity that run through your motherboard and every circuit, this surge isnt big and it only happens for a split second but excessively turning on your computer can damage some of the circuits but this usually doesnt happen.\n\n  I myself usually just leave it on and restart about once a week, and at times I have turned it off every night. I have had my computer for 5yr's and I havent had to replace anything so its really up to you, its not anything I would worry about too much though.
1123440
It depends when you change it - the rate fluctuates constantly. A good resource can be found at:\n\nhttp://www.xe.com/ucc/
612763
yes fan consume only 100 watt and AC consumes 1000 wattl 10 times less
993745
Check with the city's Energy Office (might have a different name but every city has a similar agency). They can offer short-term assitance to folks who can't pay their energy bills.  That will at least keep the lights on.\n\nAs far as the previous landlord, there is not much you can do.  His defense will be that you could have simply overpaid your monthly electric bill to avoid getting caught short; in fact, the electric company where I live actually recommends doing that, if you get to your third month with an estimated reading. Since he's not the landlord any more, you can't really go back in time and force him to let the utility companies have access to the meters. And technically it's not his fault for your getting behind in the bills because your bill states if it is an estimated or actual reading; it's common knowledge that estimated readings are always too low and months of them could take a bite out of your pocket; and you were always welcome to overpay the bills.
739136
Go get a new 450+W PSU. This way, there are no worries. A calculator is linked below.
569985
to run a house about $5,000.  to add everything else to because it produces DC power (like a battery) and a house used AC power: $50,000 and another $10,000 for engineering, and $5,000 for somebody to install it all for a total of about $70,000 given that the average house power bill is about $100-200 it would take about 30-60 years to break even (not including maintainence costs and its an unreliable power source).  Moral of the story...just buy power from the utility!
1093323
Yes and no.  Speaking generally, the moving parts and power supply in your computer (fans and hard drive motors) suffer from being run constantly.  The electronic components suffer from voltage spikes when being powered on and off.  Many people argue that leaving the computer on constantly makes more sense; it's easier and cheaper to replace a fan motor than it is to replace a motherboard. \n\nTechnical considerations aside, leaving you computer running 24/7 will not do any serious harm to your system.  Neither will shutting it on and off once or twice a day.  Rebooting several times a day, every day, may have a measurable effect on your computer's lifespan, but it will probably make no practical difference.  It's much more likely that your computer will be obsolete before components actually start wearing out.\n\nThe overheating argument is moot.  You computer should NEVER overheat.  If it does, you need to fix your overheating problem, not ignore it by rebooting constantly.\n\nOne important thing to consider: Windows XP has an inherent memory leak.  It constantly writes to the cache while it's running.  Over time, this sucks up RAM resources, and makes your computer run more slowly.  This problem is less noticeable with high RAM machines, but most computers running XP will have a noticeable loss of system performace if left running for a week or more.  Unless you have special software for configuring your system cache (available on the internet), the only way to clear the cache and reset your memory is to restart the machine.
627569
It's a simple matter of adding up the power required by everything, EVERYTHING, you want connect to your supply.\n\nMachines, tools, heating, cooling/air conditioning, ventilation fans, lighting, computers, printers, copiers, telephones, fax machines, answering machines, refirgerators, freezers, water coolers, security devices, etc, etc, etc.\n\nChoose a generator with a capacity at least a bit greater than your total load, but preferably quite a bit more to allow for future load increase.
1130282
How are you gonna haggle with a company so big, they actually send you brochures on how to REDUCE YOUR ENERGY BILL.  Believe me, you can either pay the fee or live in the dark.
766038
Depends on the computer, but the typical PC consumes around 0.5 kWh in an hour.
469764
did you pay your electricity bill?
776555
You will not reduce your electricity bill by improving your power factor.\nDomestic consumers are billed on kWhrs NOT on kVAhrs......\nHowever, there is a proviso......\nI²R (watts) losses due to heating of wiring/equipment  in your domestic situation will be billed. However, the extra reactive amps that cause heating losses in wiring & equipment will be so small as to be insignificant......\nSource: Electrical Engineer (ret.) with 45+yrs. experience
143811
Aboslutely, provided the fans are for 12V service.  Leave the secondary center tap unconnected, and put each end of the secondary to the AC input of the rectifier.  The + goes to the red lead of the fan; the - goes to the black lead (traditionally speaking of course.) Now the supply will be very ripply, with a 120 Hz waveform which could be more than a volt.  If you put a 470uF 35V capacitor across the plus and minus of the rectifier, you will smooth out the ripple, but increase the voltage above 12 volts.  Make sure the fans can take the increased voltage.  Transformers are rated at the RMS output at the 3 amps in your case.  The peak voltage will be around 1.4*12.6, but in practice I have never seen it go above 15 V with a load.  Therefore at 1 amp, if you put a cap on the supply, it may produce excessive voltage.  Check it with a voltmeter-- you may luck out.\n\nI have been in a similar situation.  Get a 5 watt resistor at maybe 1 to 3 ohms.  Insert it in series between the capactitor positive and the fans wired in parallel.  When running, use a voltmeter on the fan circuit.  Increase the resistor till you get 12V or thereabouts.  The resistor will get hot, so leave the leads long and connect them to a terminal strip or block if possible, and mount it in the airstream.\n\nCheck out the LM7812, however, at 1 Amp.  Google it, or check out jameco.com for the part.  Put a 470uF at 35 V at each end of the regulator to keep things very smooth.  Your fan will run perfectly with the voltage regulator.  Be sure to mount the tab on a heatsink to keep it cool since you are running it at full capacity.
717868
5 A is wished at the least. It depends strongly of your electrical needs.