For light.
some people use heat lamps to keep their cold blooded pet warm so that they can bask in "the sun"
There are 3 darks lamps that people use as light when they do it HARD
The primary use for whale oil was for fuel in oil lamps. (This was made obsolete with the invention of electricity and electric lamps.)
Candles, Gas lamps and fire torches :)
That one type of salt that people use with lava lamps
Many lamps use electrical energy, but some lamps use chemical energy, for example a kerosene lamp or a candle.
to see
they stopped using candles, kerosene, oil lamps and fire torches in the late 19th century
Most light in America is provided by electric lights not oil lamps. However there are two types of oil lamps still sometimes used (mainly for decorative purposes): chimney lamps and tiki torches. Chimney lamps use a highly purified odorless kerosene type oil. Tiki torches use a nonspecific petroleum distillate oil.
yes they did
yes
By leaving things such as lights on when they are not in use. Even leaving things such as lamps, your laptop, etc plugged in to the wall socket when they are not in use drains and wastes electricity.