When a bulb glows it emits both heat and light.
When an electric bulb glows, light energy is converted into electrical energy.
A bulb glows when it gets heated to a large extent due to the heating effect of current. Then, how does the bulb glow immediately when we switch it on? Doesn't it need some time to get heated up?
In addition to visible light, which other type of radiations are emitted by a 100 W electric bulb when it is glowing?