"Watered-Down Electricity" (see page bottom for site guides)
Samples from Book
What is Alternating Current?
electricity stops going one way and then starts going the
other. Well, actually it does! It is only because it
reverses or alternates so quickly that you don't notice the
flickering. Every time the electricity reverses direction it
is called a cycle, and the normal house electricity cycles
60 times every second. That explains why you don't observe
the change -- because it happens so fast. If the number of
times it cycled or alternated was a lot less, say 5 times
per second, you would be able to see the brightness of the
light change..."
Inside a dam
An efficient "as-needed" water heating system
rooms where one would normally need hot water, like bathrooms
and kitchens. Instead of heating water all the time, these
heaters only heat water when the hot water is turned on at
the sink, shower or tub. Heating water "as needed" saves
energy and natural resources, plus there is no need to run a
hot and cold water pipe through the whole house -- only a
cold water pipe. This is because the hot water is supplied
right in the room where it's needed, instead of coming from
one source in another room of the house or garage..."
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