Light bulbs
Which light bulb lasts the shortest?
Incandescent light bulbs
Who created the davy lamp?
Humphry Davy
When did people start using the incandescent light bulb?
1882
What did poor people use?
Rushlights
Which light bulb did people first start using?
The incandescent light bulb
Which inventor is currently living?
Nick Holonyak Jr.
When was the halogen light bulb invented?
1959
What did wealthy people use?
Beeswax and spermaceti candles
Which light bulb did the U.S stop producing?
Incandescent light bulb
Who invented the halogen light bulb?
Elmer G. Fridrich
When was the Davy lamp made?
1802
Which light bulb causes greenhouse gas?
Incandescent light bulb
Which light bulb lasts the longest?
LED light bulbs
Who invented the incandescent light bulb?
Thomas Edison
When was the LED light bulb invented?
1962
How many dollars can an LED light bulb save in energy?
$250 billion
What light bulb do most people use?
LED light bulbs
Who created the first lamp for lighting?
Humphry Davy
In 1925, how many homes in the U.S used light bulbs?
Half of them
How many tons of greenhouse gas does an LED light bulb reduce?
180 million metric tons