1000 watts=1kilowatt (kw). How many kilowatts were saved over the lifetime of the bulb?

Answer 1

For what bulb? Are you trying to do a CFL to incandescent comparison?

kW is a 'demand' or capacity value, IE the instantaneous load when the bulb is turned on. In that case, a 23W CFL (lumen equivilent to a 100W Inc) saves roughly 75% demand.

kWh (kilowatt-hours) is the energy used to run a given load over time.

Assume a CFL lasts 8,000 hours and an incandescent 800 (it's usually around 750, but this makes the math easier)

100W x 8,000 hours = 800,00 watt-hours / 1,000 = 800 kWh

23W x 8,000 hours = 184,000 watt-hours / 1,000 = 184 kWh

So you would save 616 kWh over the life of one CFL. If you want to make a true econonomic comparison, don't forget to add the cost of replacing the incandescent bulb 9 times.

Answer 2

Watts, (and KiloWatts), are power levels, not
measures of energy used.
For energy, you need Watts x Time.

Answer 3

yes .... so?

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