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Compact fluorescent light (CFL) bulbs have been avaiable for years; they are bery efficient but a little pricey. A CFL bulb that puts out as much light as a 60-W incandescent bulb might costs $10, compared to about $1 for the incandescent bulb. But CFL bulbs are expected to last (on average) 15,00 hours, compared to about 1000 hours for an incandescent bulb. so it is easy to say that you would meed 15 incandescent bulbs (total cost $15) to last the 15,000 hours that you would get from one ($10) CFL bulb; you save $5 and a lot of climbing ladders to replace all those incandescent bulbs.
But theres more. A CFL bulb that puts out as much light as a 60-W incandescent bulb will use about 13W or power. according to the US Energy Information Administration, residential electricity costs average about $0.10 per kilowatt/hour (1kQ/h=3600 kW/s=3600 kJ). Over the 15,000 hours that one CFL bulb is expected to last, how much will you save on power if you replace an incandescent bulb in your home with a CFL bulb.
Find the Total energy cost and savings from using both CFL bulbs and incandescent bulbs.
A reinforced concrete beam having the cross section shown is on a simple span of 28ft. It carries uniform service loads of 3.60 kips/ft live load and 2.20 kips/ft dead load. Check the adequacy of the beam with respect to the moment.
If you deposit $1000 per month into an investment account that pays interest at a rate of 6% per year, compounded quarterly, how much will be in the account at the end of 5 years
nbspa segment of urban four-lane two lanes in each direction has a 3 upgrade that is 1500 ft long followed by a 1000-ft
An open rectangular tank contains water up to about half its depth. this tank accerlerates at a=2.2m/s2 up a slope of alpha, which causes the free water surface to form an angle theta with the horizontal plane. what is angle aplha of the slope
the difference between the total and static pressure before a shock is 75 psi. what isnbspthe maximum static pressure
A 32-in.-wide by 0.125-in.-thick by 110-in.-long steel sheet is to be formed into a hollow section by being bent through 360° and having the long edges welded (i.e., butt-welded) together. Assume a cross-sectional medial length of 32 in.
A single screw extruder is being used to process pregelatinized starch. The screw dimensions are as follows: channel width 3 cm, channel height 0.5 cm and screw length 50 cm. The wall velocity is estimated to be 0.31 m/s.
Achieve a concentration of 0.5%wt of carbon at a depth of 0.2 mm below the surface of the slab of a metal. The initial concentration of carbon in the metal is 0.1wt%. We first do an experiment by applying a concentration of 5%wt of carbon at the surf..
1. the u.s. has produced the following quantity of gauges and potatoes with the price of each listed in dollar
for a laminar flow of a newtonian fluid in a tube of a circular cross section, show that the ratio of mean shear to the wall shear rate is 2/3
An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank.
A 1600 ft long sag verical curve (equal tangent) has a pvc at station 1200+00 and elevation o 1500 ft. the initial grade is -3.5% and the final grade is 6.5%. determine the elevation and stationing of the low point, pvi and pvt.
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