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How much energy is used if 500 watts of power is left on for 5 hours?
Wiki User
∙ 8y ago
A kilowatt hour is equal to the amount of electrical energy consumed at a rate of one kilowatt. 1 kilowatt hour is the same as 1000 watt-hours.
So using that principle. A 500 watt microwave will consume 500 watt-hours in an hour, or 0.5 kilowatt-hour.
Comment
In practice, it's difficult to determine an answer to your question, because microwaves don't operate continuously but, rather, in short bursts. Without knowing the cycle rate of each burst of energy, it's impossible to come up with a definitive answer.
Wiki User
∙ 9y ago
Wiki User
∙ 8y agoThe light bulb uses .075 kilowatts. This consumption for five hours is equal to .375 kWh. This number is multiplied by the price that you are charged by your utility company for a kWh. The result will be what it costs to operate the lamp over a five hour period.
Wiki User
∙ 14y ago1 Watt = 1 Joule / sec
500Watts*5 hours*3600 seconds = 9,000,000 Joules per 5 hours = 2.5 Kilowatt hours per 5 hours.
Wiki User
∙ 11y agoIt uses 75 watts times 5 hours, which is 375 watt-hours. That is 0.375 kilowatt-hours, also known as 0.375 units.
Wiki User
∙ 11y agoIf the bulb is not being used, 50 watt-hours are wasted, which is 0.05 of a kilowatt-hour, or 0.05 units.
In Joules it is 50 x 3600, or 180,000 Joules.
Wiki User
∙ 8y ago2.5 kilowatt hours is used if 500 watts of power is left on for 5 hours
Wiki User
∙ 14y agoAbout 2.5 KwH.
Wiki User
∙ 11y ago75 x 5 equals 375 watt hours, 0.375 kWh.
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How much electrical energy does a 40w light bulb use if it is left on for 12h?
75W means bulb which give 75W power when connected to domestic light. Power is nothing but energy per second. Thus energy consumed by bulb can be calculated as follows. E = 75*60*60*4J = 1080kJ
How many watts does it take to convert all of a half gallon of water at 55 degrees to 100 percent steam in less than 24 hours so that there's no more water left?
57.73 watt-hours load for 24 hours It takes about 1 Kw of electricity to produce 3.5 lbs of steam from and at 212 F That is 970.2 btu of heat for every 286 watts. 1/2 gallon of water is 4.17 lbs of water. to raise the temperature and convert 1 lb to steam at 100% quality requires 1127.2 btu. for 4.17 lbs that is ~4700 btu. dividing that by 970.2btu/286w = ~1386 watts of energy needed. dividing that by 24 hours will give you a continuous load of 57.73 watt-hours for 24 hours to evaporate 1/2 gallon of water, exclusive of heat losses.
How much energy will a 100w light bulb convert to light and heat if it is left burning for 1hour?
Power = Energy/time 100W=Energy/360 Seconds Energy = 100/360 Energy ≈ 0.27 Joules
Should you still use nuclear power?
Nuclear power is very good source of energy to turn to. The only problem is the storage of nuclear waste, that is left over after the nuclear reaction the power plant. The energy obtained from the nuclear power plant is very clean burning and more KJ/mole energy.
How much energy does a 100 watt light bulb use if it is left on all day?
100watts x 24 hours
160.75 Watt hours equals how many kilo-watts?
Watt hours means energy or work and watts means power. You can never convert this. However, if you mean kilowatt hours, simply move the decimal 3 places to the left: .16075 kwh.
How much electrical energy does a 40w light bulb use if it is left on for 12h?
75W means bulb which give 75W power when connected to domestic light. Power is nothing but energy per second. Thus energy consumed by bulb can be calculated as follows. E = 75*60*60*4J = 1080kJ
How many amps in a 300watt bulb?
There are zero amps in a 300 watt bulb. Watts are the product of amps times volts. W = A x V. To find amperage use the equation A = W/V. If you find the voltage of the 300 watt bulb uses, divide the wattage by the voltage and it will give you the amps of a 300 watt bulb.
What formula do you use to determine the amount of energy used by an appliance?
Power use of an electrical appliance is calculated by finding its rating in watts. The formula is W = I x E. Watts = Amps x Volts. <<>> Power is a general term. If you want to know how much you pay to power a certain appliance you need to figure out the amperage of the appliance, (usually located on the appliance itself or in the instructions). Power companies use kilowatt hours to charge you for electricity, to figure out how many kilowatt hours your appliance uses you would need to multiply the amperage your appliance uses by .115 and that would give you the kilowatts it is using. Then you would multiply that by how many hours you use said appliance and then multiply by your cost per kilowatt hour, (found on your electric bill).
Which lightblub uses the most energy?
The one with a high number of Watts left on for a long time.(Your neighbour's 500W garden floodlight that's left on all night.)The energy a lightbulb uses is it's power multiplied by the amount of time it is used for. A lightbulb's power is measured in Watts (W).The old fashioned incandesant bulbs are often 40W, 60W or 100W, but much of the energy they use produces heat not light - not very efficient.Mains or 12Volt halogen bulbs are usually 50W, 35W or 20W - these still produce wasted heat but are more efficient than incandescent bulbs.Low energy bulbs are only 7W, 9W or 11W and are very efficient hardly any energy wasted as heat.LEDs are low power e.g. 3W and also very efficient - but often less bright.So the lightbulb that uses the most energy is one with a high number of watts left on for a long time.
How many watts per year?
Watts is the product of amps times volts. As you can see this combination could have lots of variables depending on the different voltages that are in use and the variable amperage's of multiply loads. To find watts per year you would first have to find the wattage of the device, then extend it to watts per hour if the device is continually on. Then take this figure times 24 hours in a day and then finally times 365 for the days in a year. This will give you the answer that you are looking for.Alternate answer: The question is fundamentally meaningless. A watt is a measure of energy per unit time. An appliance that uses 60 watts, will use 60 watts in a second, 60 watts in a minute, 60 watts in an hour, or 60 watts in a century. Total energy can be expressed in units like "kilowatt-hours" (equal to 1,000 watts for one hour, or 100 watts for 10 hours, etc.). Our 60-watt appliance, left on continuously, will use about 525 kWh per year.
How much energy does the energy-efficient computer save?
If no, or few, applications are left up and running a computer will not consume much power when left on. Computers in general consume less power then a single light bulb when running. At idle they may go down to as little as 30 watts depending on age, speed and configuration of the computer.
What does kilowatt hours mean?
kWh = Power(kW) x Time (hours)AnswerA kilowatt hour (symbol kW.h) is a unit of measurement of electrical energy.
How many kilowatt is in 1 hour?
A kilowatt hour is not in and of itself a measurement of time. It is power in watts (more specifically kilowatts) multiplied by time in hours. A kilowatt is equal to 1000 watts. If a device uses say 2500 watts for 1 hour, that is equal to 2.5 kilowatt hours. If that same device is used for 2 hours it is equal to 5 kilowatt hours. Right. And it is power multiplied by time, which is energy and is what you pay for on your inappropriately named "power consumption" energy bills.
What does 3.9Wh stand for?
Wh is the symbol for watt hour, a unit of energy. Specifically it is used most often with respect to the amount of energy consumed from a power source. Electric Utility companies sell electricity to local residents and businesses in units of kilowatt hours (kWh). A kilowatt hour is equal to a thousand watt hours. If a device that draws 3.9 watts of power is left plugged in and turned on for one hour, the total energy consumed is 3.9 Wh. The same is true of a 39-W device that runs for six minutes, a 13-W device that runs for 18 minutes, a 1.95-W device that runs for two hours, and so on. In every one of these examples, the product of the power consumption multiplied by the run time is 3.9 Wh.
A low amps power source is converted into volts and powers a 60 watt light bulb what is left?
40 watts
Which costs more running a 1200-W hair dryer for 5 minutes or leaving a 60-W lamp on overnight 10 hours?
The amount of energy that is consumed by a 1.20 kilowatt hair used used for twelve minutes is approximately fifty seven kilojoules and the amount of energy consumed by an eleven watt night left on for ten hours is approximately twenty five kilojoules.
