If light bulbs are connected in series to a voltage source, the brightness of the individual bulbs diminishes as more and more bulbs are added to the “chain”. The current decreases as the overall resistance increases. The current increases as more bulbs are added to the circuit and the overall resistance decreases.
How does a light work?
When electricity flows through the filament, the lamp gives off light and gets hot in the usual way. In a normal incandescent lamp, the filament is made of tungsten metal and surrounded by a nonreactive (“inert”) gas such as argon.
What stops electricity from passing through?
One type of metal, copper, is most often used for electrical wires since it is very easy to bend and is inexpensive to mine and to produce wire from it. Materials that do not allow electricity to pass easily through them are called insulators. Rubber, glass, plastic, and cloth are poor conductors of electricity.