Electric Light Slides

Electric light. What was used before. Before electric lighting became common in the early 20th century. When it was invented. English chemist Humphry Davy developed the first incandescent light in. What you use it for. In addition to. How does it work? When the bulb is connected to power supply. Why you couldn't live without it. What would happen if there was no electricity. What price. The price of. Else facts. __Thomas Edison. Links.

The price of light bulbs depends on bulbs firm can be very cheap or very expensive. More depends bulbs power, volts. Bulbs price from 80cents to 3euros and more.