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August 27, 2014

Homework Help: physics

Posted by 4611star on Wednesday, February 29, 2012 at 12:33pm.

1A)
A filament lamp-
cost- 80p
effiency- 0.2
expected life- 1000 hours

a compact fluorescent lamp (CFL)-
cost- 3.00
effiency- 0.8
expected life- 8000 hours

a filament lamp with a power rating of 100W gives 2000 units of light.
what power rating would a CFL need to provide 2000 units of light?

a)8000W
b)20W
c)25W
d025W

1B)
elecricity costs 15p per KWh.

what will be the cost of using a 100W filament lamp during it's expected life?

a)1.50
b)15.00
c)150.00
d)1500.00

1C)
in it's lifetime, a security light is used for 15000 hours.
how much would you expect to spend on buying CFLs for the security light in that time?
a)5.63
b)6.00
c)12.00
d)45.00

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