which filament is thicker between 60watt bulb n 100watt bulb?

Answer 1

The 100W bulb has less resistance, hence the filament must be thicker, or else the length of the filament is shorter.

To show it mathematically,
P = (V^2)/R
where
P = power (in watts)
V = voltage
R = resistance
The thicker filament will be less resistance to current,
hence power is greater...
Therefore, the 100watt bulb has thicker filament.

Answer 2

The 100 W bulb. Here's a different way to think about it, in addition to the good answers already provided.

Standard tungsten lamp filaments generally run at about the same temperature, around 3000 Kelvin. So why does a 100W bulb radiate more power than a 60W bulb? Because the total surface area of the filament is larger for the 100W bulb.

This brings us to Fact #1:
For the 100W filament to have a larger surface area, it must be either thicker or longer than the 60W filament.

As already stated by others, the 100W filament must also have a lower resistance, in order to consume more power at the same voltage:
power = V^2 / R, so lower R means higher power

And so we have Fact #2:
For the 100W filament to have a lower resistance, it must be either thicker or shorter than the 60W filament.

AND FINALLY ... the only way for Fact#1 and Fact#2 to be true is that the 100W filament is thicker than the 60W filament. (Since it can't be both shorter and longer than the 60W filament.)

Answer 3

I don't think it is thicker. I think the metal is of different material.
The 100 watt light bulb is higher resistance value, and will burn brighter, more current conducts. The idea that a thick wire, has to be ruled out, because it will not illuminate like thin wire.

So after further thought, they have to be exactly the same size filament, only the material will be different.

Answer 4

Assuming the lengths are equal and of identical material, then definitely the 100w. And not because "it has to burn brighter", but because, since P = EI, it must allow more current from the same voltage to get 100w, so the filament must be thicker.

Absolutely the 100w

Answer 5

120 v AC through thick wire has less resistance than the same current passing through thinner wire. I think, but I'm not positive, that a 100 watt bulb using the above current would have a thinner wire, as the thinner wire would get hotter and thus brighter.

Answer 6

100 watt. It needs to handle more current and dissipate more heat.

Answer 7

Which will conduct the most current without burning up.