Why is tungsten get heated when current passing through it?

25.2. A tungsten-coiled filament is held by molybdenum filament supports and connected to lead wires. An electric current passing through the filament raises the temperature of the filament so it becomes incandescent, emitting light and heat.

Why the filament of an electric bulb in an electric circuit does get white hot but not the connecting wires?

The filament of an electric bulb is made up of tungsten having high resistance. So much heat is produced that filament of bulb becomes white-hot and gives light. The resistance of connecting wires is very low and hence the connecting wires do not get heated.

Why is it so that the filament wire of the bulb glows and the wire of the bulb does not glow on passage of the same current through both?

The filament of a bulb is made of tungsten which has high resistance. Due to this high resistance, heat is produced in the filament which makes it glow and emit light. The connecting wires are made of conducting materials with low resistance due to which no heat it generated and it does not glow.

Why does an electric bulb get hot if it is kept on for a little while?

Because when we flow Electricity to the bulb it passes through the filament of the Bulb when it gets hotter it lights up. When we light the bulb the filament produces heat energy and light energy. Due to heat energy the bulb get hot.

Why tungsten is used in cathode and anode?

The high atomic number of tungsten gives more efficient bremsstrahlung production compared to lower atomic number target materials. An alloy containing tungsten and rhenium is also used because the addition of 5-10\% rhenium prevents grazing of the anode surface.

Why hotter filament is used in cathode ray tube?

For example, in most vacuum tubes the cathode is a nickel tube, coated with metal oxides. It is heated by a tungsten filament inside it, and the heat from the filament causes the outside surface of the oxide coating to emit electrons.

What is the filament of the bulb made up of?

tungsten
Now, filaments of electric bulbs are made up of tungsten. To understand why, let us look at some properties of tungsten that contribute to its versatility. As a metal, Tungsten is a good electrical conductor. It is also a good thermal conductor.

Why does the filament glow?

Why does the filament glow? Electricity flowing through the filament is essentially just electrons moving along the wire. The movement of these electrons isn’t smooth: as well as moving in one direction, they are also bouncing around, hitting each other. As the electrons fall back, they emit photons of light.

What is the metal wires that glow brightly when electricity flows through them?

Coiled tungsten filament – the metal wires that glow brightly when electricity flows through them.

When electric current passes through a wire it behaves like a magnet it is the dash effect of current?

So, when electric current passes through a wire, it behaves like a magnet. This is the magnetic effect of the electric current.

When electric current is passed through the filament of a bulb it gives off?

When electric current passes through the filament of a bulb, it gives off heat and light.

Why is the cathode made of tungsten?

Cathode. Made of thin (0.2mm) tungsten wire because tungsten: Has a high atomic number (A 184, Z 74) Is a good thermionic emitter (good at emitting electrons)