discussdfthedftransformationdfofdfpotentialdfenergydfofdfwaterdfasdfitdfflowsdfbeh
inddfadfdamdfasdfitdfflowsdfthroughdfadfpipedfatdfthedfbottomdfofdfadfturndfgenerator
df-dfcorrectdfanswer✔ ✔
thedfwaterdftransformsdffromdfpotentialdfenergydftodfkineticdfenergydfasdfitdffl
owsdftodfthedfbottomdfofdfthedfgenerator,dfthedfflowingdfwaterdfturnsdfondfthedfge
neratordfwhichdfcreatesdfmechanicaldfenergy,dfwhichdfthendfconvertsdfmechan
icaldfenergydfintodfelectricdfenergydfasdfthedfgeneratordfproducesdfelectricity
referdftodfthedfthedfdiscussiondfofdfenergydflossesdfindfadfcar.dfwhatdfaredfsomedfw
aysdftodfincreasedfthedffueldfeconomydfofdfadfcar?df-dfcorrectdfanswer✔ ✔
1.dfthedfspeeddfmustdfbedfkeptdffromdf40-
50dfmphdftodfincreasedfthedffueldfeconomydfofdfadfcar
2.dfadfdecreasedfindfthedfusedfofdfcars
3.dfreductiondfofdfemissiondfofdfgreenhousedfgasesdffromdfthedfburningdfofdffuel
df
4.dfreductiondfindfgasolinedfconsumption
categorizedfthedffollowingdfunitsdfasdfofdfworkdfordfpower:dfjoules,dfwatts,dfkilo
-wattdfhours,dfft-lb,dfcalories,dfkW,dfft-lb/min.df-dfcorrectdfanswer✔ ✔
Work:dfJoule,dfft-lb,dfcalorie,dfKilo-wattdfhour
Power:dfft-lb/min,dfkW,dfwatts
, howdfmuchdfworkdfdodfexpenddftodfmovedfadf450lbdffridgedf6dffeetdfacrossdfthedff
loordfwhiledfexertingdfadfforcedfofdf90lbs?df-dfcorrectdfanswer✔ ✔ W=FxD
sodf90lbsdfxdf6dffeetdf=df540dfft-lbs
adf100wattdflightbulbdfisdfaccidentallydfleftdfondffordf2dfdays,dfifdfelectricitydfcos
tdf12dfcents/kWh,dfhowdfmuchdfdiddfthisdfoversightdfcost?df-dfcorrectdfanswer✔
✔ So,
Stepdf1:df100Wdfxdf48hoursdf=df4800Whdf
Stepdf2:df(1kWh/1,000Wh)=df.001
Stepdf3:df.001dfxdf4800Whdf=df4.8Kwh
Stepdf4:dfSodf4.8kWhdfxdf12dfcents/Kwhdf
=df57.6dfcents
Supposedfthedfoveralldfefficiencydffordfthedfconversiondfofdfthedfchemicaldfener
gydfofdfcoaldfintodfthedfusefuldfmechanicaldfworkdfofdfandfelectricdfmotordfisdf29
%.dfIfdfthedfefficiencydffordfthedfproductiondfofdfelectricitydfisdf35%dfanddfthedfef
ficiencydffordfitsdftransmissiondftodfthedfmotordfisdf85%,dfthendfwhatdfisdfthedfeffi
ciencydfofdfthedfmotordfitselfdffordfconversiondffromdfelectricaldftodfmechanical
dfenergy? df-dfcorrectdfanswer✔ ✔ So,
.35xdfxdf.85xdf=df.29
.35x.85=.2975x
.29/.2975=.9748
x=97.4%