Question

why does an electric bulb glow when a current passes through it?give an activity.​

Answer 1

Answer:

this

Explanation:

The filament of an electric bulb glows because of the heating effect of electric current. As the current passes through the bulb it heats the filament which gives off light. ... The filament then heats up and becomes red-hot as a result of this it begins to glow, turning electrical energy into light energy.

Answer 2

Question:

• Why does an electric bulb glow when a current passes through it? Give an activity.

Answer:

An electric bulb has a filament of tungsten metal. Tungsten has a high resistance. When current passes through the wire, heat is produced in it (Heating effect of current). Due to this filament heat up to a very high temperature and starts glowing. Therefore an electric bulb glows when a current passes through it.

Extra Information:

• Heating effect of current is also used in other appliances like - electric iron, room heater, etc.
• Magnetic effect of current is used in appliances like - electromagnets, electric belles, etc.