A 60 w bulb has a filament temperature of 2000 K. what will be the wattage of another bulbs of same filament area and material at a temperature of 4000 K?

What is the advantage of an LED bulb over the filament electric bulb?

What is the advantage of an LED bulb over the filament electric bulb ?

A 100W bulb and a 25W bulb are desigened for the same voltage. They have filaments of the same length and material. The ratio of the diameter of 100W bulb to that of the 25W bulb is

Name the material used for filament of an electric bulb,

An electric bulb with a tungsten filament has an area of 0.20 cm^2 and is raised to a temperature of the bulb to 3000 K emissivity of the filament is 0.40 and Stefan's constant is 5.7 xx 10^(-5) erg s^(-1) cm^(-1) K^(-4) . The electrical energy consumed by the bulb is E_1 watt. If due to fall in voltage, the temperature of the filament falls to 2800 K, then the wattage of the bulb is E_2 watt. Calculate the value of E_1 - E_2 , close to nearest integer.