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Because electricity is flowing through it.
If you are referring to a light that turns on automatically at night and off in the day, this is usually done with an electronic switch controlled by a photocell. However some are controlled by electromechanical timers and involve no electronics at all.
What else can I help you with?
What elements light up a light bulb?
argon is an element that make up a light bulb
What shines at night time?
A light bulb...LOL jk you cant afford a light bulb so nothing shines in your lamp.
What is the minimum watt of a light bulb for night reading?
40 watt light bulb. This is obvious. Go do an experiment. -_-
Why does the brake light on the integra not light up when you turn on the light but it light up when you brake?
The Integra uses a dual-filament bulb in the tail light, which has one contact for the running light (the lights you turn on at night) and another brighter one for the brake light (only goes on when you press the brake pedal). You have replaced the bulb with the wrong type. You will need a 2057 bulb for the Integra.
What was the affect on the world when Thomas Edison invented the light bulb?
Before the light bulb, darkness could hardly be illuminated. The light bulb made possible lighting up streets, homes, businesses, etc, in the day or the night. The production of the light bulb also provided jobs. The light bulb paved the way for many of the technological advancements we take for granted today.
How long does a night light bulb last when used continously?
A night light bulb typically lasts around 1,000 to 2,000 hours when used continuously. This can vary depending on the type and quality of the bulb.
What elementes make up a light bulb?
argon is an element that make up a light bulb
Is it safe to leave a night light on all night?
Yes , it is safe to leave a night light on all night , however it depends on the size and the bulb.
What did one light bulb say to another light bulb?
"Watt's up?"
what's a alliteration for light bulb?
light bulb lights up london
What common elements make up a light bulb?
argon is an element that make up a light bulb
Why does a light bulb light in a closed circuit?
A bulb does not light up if there is no voltage available across the bulb, or if the bulb is burned out.
