2007-03-19 12:26:23 · 6 answers · asked by Snarles 1 in Science & Mathematics ➔ Physics
A light bulb has a filament that is very small. The amount of energy, (EMF), that has to pass through this small wire, heats the wire or filament up, which makes it glows. If the light bulb is in series with the next light bulb, then this adds more Resistance. Otherwise, the light bulb would not add resistance if wired in parallel.
2007-03-19 12:42:05 · answer #1 · answered by Skip 3 · 0⤊ 0⤋
inside a light bulb is a filament wire which means a current will have to pass through it. If there is current passing through it there must also be a voltage and resistance and this explains why the resistance is increased.
> wire, > resistance
2007-03-19 19:32:02 · answer #2 · answered by Maureen 3 · 0⤊ 0⤋
The filament is composed of a coil of metal tungsten. Tungsten is not the world's best conductor (compared with silver, copper, aluminum, or gold). It has higher resistivity than those metals.
Resistance = resistivity * length / cross-sectional area
You have a higher-than-normal resistivity, a length of wire, and a certain cross-sectional area of the wire in the filiment, hence you have resistance.
./
2007-03-19 19:31:28 · answer #3 · answered by tlbs101 7 · 0⤊ 0⤋
The filament in the lightbulb causes resistance when it changes the electric energy to light energy.
2007-03-19 19:30:15 · answer #4 · answered by George 2 · 0⤊ 0⤋
Because its really a controlled short circuit !
2007-03-19 19:30:32 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Because if there didn't have resistance they would't get hot and light up.
2007-03-19 19:30:08 · answer #6 · answered by Anonymous · 0⤊ 0⤋