GE ENERGY CHOICE ---lite bulbs
processes: measuring / inferring / interpreting data / hypothesizing
GE sells energy saving bulbs in green packaging -- vs. the common white packages.
However - since this activity sheet was designed -- GE -- or some consumer group -- revealed data that these bulbs weren't as energy saving as claimed. To be continued . . .
concepts:
- watts are units of electrical energy
- technology has improved light bulb efficiency
- efficiency = energy in vs. energy out
- electrical costs vary with the seasons
- electrical energy costs have a surcharge
application:
this 8-pack is marked 75 Watts but only uses 67 Watts of
of power BUT produces the same amount of light (l080 lumens) as
the 75 Watt bulb.
$$ ---watt's the savings --- $$
This means there is a ______ WATT savings per bulb, and during the 750 hours
lifespan, _________ Watt-hours are conserved.
A kilowatt hour (KWH) equals
1,000 Watt hours, so the above saving would be ______ KWH.
CIPS charges
a yearly average of 7.52¢ per KWH, so each bulb saves ________.
For the entire
8- pack it means lots of $$$ is saved.
The total would be: ________.
varying rates per KWH -- (CIPS) -- 1991
Hi: 7.346 in feb & october --- & --- Low: 5.45 in july
surcharge: Hi = 1.37 in july --- & --- Low = 1.06 in march
what variable must be examined to know if you really saved money or not ?
12/4m/95 -- 3/26t/96