OCR Text |
Show one- hour; it will pump 100 gallons of water to a he got of 25 feet; coinprest 470 cubic feet of frc air loo pounds; drive an ordinary passenger elevator I 175 feet; print 2,r,00 circulars on a 12 by 21 Job press, or 1,000 sheets on a 32 by t7 cylinder press; run a sewing ' machine for two hours; supply air foe a church organ for one service; mix 2 1-2 cubic yards of concrete; heat a 2-pinl chafing dish for four hours; mix sufficient dough for U0 loaves of bread and gr.nd (100 pounds of coffee. It will drive a runabout 4 1-2 miles or a 3-ton truck one mile. MlnlDg Set ence. FACTS WORTH KNOWING ABOUT ELECTRICITY Kiectrleitv is measured by tho kilowatt kilo-watt hour. The rates for buying cur-lent cur-lent from the electric light plant for power, light or heat are always so much for each kilowatt hour of clee trlcity consumed. To explain the term ueeds, lirot, a dear definition, a d then a comparison. Every one w ill understand that a certain amount of force must bo iioed t drive electric energj through a circuit This force is measured In volts; thus wo have 110-volt circuits, and 22-olt circuits, the one expressing just twice the force of the other; but the quantity of current passing through a circuit depends uin the force aud the resistance re-sistance This quantity is expressed by a different term, namely ampheres. Now the efficacy of ,the current depends de-pends upon both force and quantlU , and to express this cllkaey or united action we multiply the force by the quantity: that is the volts by the ampheres. We express the result in watts. Thus 110 olts multiplied by 5 aruphc-res is l.lof) watU. A kilowatt is of course l.ooo watts, .which is the equivalent to about l 1-3 horsepower. In charging a battery the lighting companies' bill for the use of so many n.ihk for so many hours; thus, 1,000 wntu tor 10 hours would bo charged as 10 kilowatt hours, which at 5 cents a Kilowatt hour would bo -ro cents, a charge that seems little enough for 10 hours' use at 11-3 horsepower. But what, a kilowatt hour U worth rnav bo Judged 'by what it will do. Thus, a kilowatt hour, figure .m engineer of the (iencrai Electric ( company, will lltii 20 lOcandle power incandoeent l.imps or to standard nrc lamps fnr |