14 Feb '06 20:59>
You have a freezer, it can store food indefinitely, great freezer.
It takes an average of 200 watts (0.2 Kw) to run.
Electricity costs 10 cents a KWH (US$) Now you buy a steak for
10 bucks. The inflation rate is 5 percent per year, that means the
price doubles in 20 years, so twenty years from now, that same steak
will cost 20 bucks. So here is the puzzle:
How long can you keep the food in the freezer before you start
spending more money on the electricity than the food? Obviously,
you spend a bit more immediately, but I am asking under those
conditions, how long will it take for the electical cost to equal the
replacement cost of the steak. Remember, the freezer can keep food
for decades as fresh as the day you bought it, its a perfectly reliable
freezer, never breaks down (Hmm, must not have any moving parts,
eh, ok, its a Peltier effect freezer, solid state type, you can get them
today). Anyway, what is the point in the freezer you want to decide
to eat the steak because it will soon cost more to keep it frozen than
to replace it.
It takes an average of 200 watts (0.2 Kw) to run.
Electricity costs 10 cents a KWH (US$) Now you buy a steak for
10 bucks. The inflation rate is 5 percent per year, that means the
price doubles in 20 years, so twenty years from now, that same steak
will cost 20 bucks. So here is the puzzle:
How long can you keep the food in the freezer before you start
spending more money on the electricity than the food? Obviously,
you spend a bit more immediately, but I am asking under those
conditions, how long will it take for the electical cost to equal the
replacement cost of the steak. Remember, the freezer can keep food
for decades as fresh as the day you bought it, its a perfectly reliable
freezer, never breaks down (Hmm, must not have any moving parts,
eh, ok, its a Peltier effect freezer, solid state type, you can get them
today). Anyway, what is the point in the freezer you want to decide
to eat the steak because it will soon cost more to keep it frozen than
to replace it.