Why does some lamp light up gradually instead of immediately?

Question

One example of such light will be light at a indoor hall

Answer 1

This is done deliberately to prevent shock to the eyes of people in the hall. When the hall is dark, the pupils are dilated and if the lights are switched on suddenly, the glare can be hurting to the eyes. So, a small electronic control is incorporated to add a small resistance which goes on decreasing, so that the lights become bright over time.

The electronic circuit is called a dimmer circuit and some variations of the same are used.

Answer 2

Some lamps like arc lamos have heavier guage wire as their element and therefore reqwuire more current to build up to overcome resitance. resistance - time

Others use a gas to help luminance and this has to be heated to begin glowing from pink to amber to blue white

Answer 3

when u switch on the current gradually increases in circuit so the lamp increases gradually


2]since in lamp the filament present is very sensitive the bulb will get fused if it is subjected to sudden changes in current

Answer 4

It takes a moment for the flow of electrons to create enough heat and light energy just like it takes a moment for it to dim after you flip the switch, the energy is still ebbing.

Answer 5

There are factors affecting the rate of combustion... the supply of alcohol or oil in the lamp may differ, the humidity (presnece of water in air), and the concentration of oxygen in that given area.

Answer 6

When you throw the switch the current is at maximum as the element heats the resistance increases, the current drops and the element is at it"s brightest.

Answer 7

If it's a fluorescent light it could have a bad ballast.