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MaintaIning current fuel efficiency ratings has what effect on the ecological footprint ratio?
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What isEcological footprint?
An ecological footprint measures how much of the planet's resources you use, and converts this to the amount of land needed to provide the resources and assimilate your waste. It is measured in global hectares (a hectare is about the size of a soccer field). It includes:* The amount of building materials you use in your home and workplace * The amount of water you use in your home, workplace and garden* The fossil fuels (oil, coal, wood and natural gas) needed* to provide the power to run your home and workplace* to bring your food from all over the world* to power your vehicles and transport * to carry away and dispose of your waste.A recent study (October 2008) ranks the top ten countries with the highest ecological footprint per head as:# United Arab Emirates # United States # Kuwait # Denmark # Australia # New Zealand # Canada # Norway # Estonia # Ireland.It is what you leave behind such as a foot print at the park. Only in this place the foot print is the resources you use up during a life time.
How much of alternate current gives 1 MW direct current?
The amount of alternating current (AC) required to produce 1 MW of direct current (DC) depends on the efficiency of the conversion process. In an ideal scenario with 100% efficiency, the AC power would also be 1 MW. However, due to losses in the conversion process, the AC power input would typically be higher than 1 MW. The exact amount would depend on the efficiency of the conversion system being used.
As the resistance of a material decreases does the efficiency of power transmission increase If so is it linear relationship and what about superconductors?
Yes, the efficiency increases. Yes, it is linear. Power lost in a current-carrying conductor is: P = I^2 * R So, if you halve the resistance, you halve the power loss. Note though that the current (I) term is squared. So if you can decrease the current by increasing the transmission voltage, the increase in efficiency is not linear, but exponential! Halve the current (and double the voltage to get the same power), and you reduce losses by four times! This is why utilities use such high voltages for transmission. Superconductors are no different, you are still talking about a reduction in resistance, superconductors just achieve a much lower resistance than a standard conductor. The question is whether the cost of superconductors and their cooling systems (currently very high) outweigh the modest gain in transmission efficiency.
What ac filter 20x20 works like an air purifier?
High Efficiency Pure Air more expensive but available where you buy your current filter.
What is the carbon footprint of a photovoltaic cell?
One current estimate is 35 to 58 g CO2e/kWh (this is explained in the last paragraph of this answer). Another estimate at the link cited below says 23.6 g CO2e/kWh for thin film CdTe cells. This compares to 25 to 80 for biomass, 3 to 10 for hydro, and about 5 to 15 for wind. I have often seen huge differences in estimates of the carbon footprint of nuclear power, ranging from 2 to 288 g CO2e/kWh. It seems that the actual number is probably more than 66 g CO2e/kWh, and very possibly more than 90.PV technology is changing rapidly, both for the actual PV and for the manufacture of PVs. The above estimate is not for thin-film PVs, and these promise to have a much smaller carbon footprint. Also, the estimate given is for PVs that are 5% efficient in producing power, and increases in power output will decrease the carbon footprint. Current PVs are mostly considerably more efficient, and at 7.5% efficiency, the carbon footprint is cut to 23 to 39 g CO2e/kWh. New, gadolinium-based PV technologies are said to be as high as 40% efficient, but I have not seen any estimates of their carbon footprints and could not guess, because I do not know how they are manufactured.By the way, thermal solar power, such as is used in solar hot water, is about 60 to 65% efficient, and has much lower cost, in terms of global warming gasses, than PVs. It has a carbon footprint that might even be smaller than wind's.The carbon footprint is calculated in grams of CO2 equivalent per kilowatt hour (g CO2e/kWh). Properly, this includes all phases of manufacture of equipment and fuel, transportation, installation, operation, and disposal. Calculations are often deceptive because steps are left out for some technologies, notably the decommissioning and disposal steps are often left out in calculation of carbon footprints for nuclear power. The "equivalent" part happens because of global warming gasses other than CO2. For example, the nitrogen trifluoried used in manufacture of photovoltaic panels is about 17,000 times as powerful as CO2 for global warming, so an estimate of the amount leaking into the environment from the manufacturing process has to be included.
does intel offset its carbon footprint?
Intel does reduce and offset its carbon footprint, with a current stated goal of 20% reduction by 2012.
Current ecological trends in hospitality industry of UK?
youu smell..!
What isEcological footprint?
An ecological footprint measures how much of the planet's resources you use, and converts this to the amount of land needed to provide the resources and assimilate your waste. It is measured in global hectares (a hectare is about the size of a soccer field). It includes:* The amount of building materials you use in your home and workplace * The amount of water you use in your home, workplace and garden* The fossil fuels (oil, coal, wood and natural gas) needed* to provide the power to run your home and workplace* to bring your food from all over the world* to power your vehicles and transport * to carry away and dispose of your waste.A recent study (October 2008) ranks the top ten countries with the highest ecological footprint per head as:# United Arab Emirates # United States # Kuwait # Denmark # Australia # New Zealand # Canada # Norway # Estonia # Ireland.It is what you leave behind such as a foot print at the park. Only in this place the foot print is the resources you use up during a life time.
What do you think the planet Earth will be like in fifty years compared to its current ecological social and economic state ?
Warmer.
Why does current alternate in our own power grid?
It's a decision based on efficiency of power transmission.
How electricity is made and its efficiency?
High-voltage direct-current (HVDC) technology is used for greater efficiency. Underground lines are strictly limited by their thermal capacity.
Increasing voltage while maintaining the same resistance will cause current to decrease?
Decrease
What is input current if output voltage is 48V and output current is 350 mA and load of 15Watt?
A: Assuming 100% efficiency 320 ma
What is a ballast resistor?
A ballast resistor is an electrical resistor whose resistance varies with the current passing through it, thus maintaining a constant current.
Starting current of 160 kw motor with star delta starting?
Assuming the Motor is IE1 Efficiency and 4 Poles, the in rush current will be 1183 A
Does current stay the same when voltage changes with converter?
No. Power stays the same. Power is voltage times current. So, if voltage is doubles, current has be halved, less efficiency losses.
What is the purpose of transmitting electricity at high voltage?
Less current, greater efficiency, reduced volt drop
