Advertisements
Advertisements
प्रश्न
Explain why, tungsten is used for making the filaments of electric bulbs.
उत्तर
Tungsten is used for making the filaments of electric bulbs because it has a very high melting point (3380°C). It does not melt down and thus remains white hot.
APPEARS IN
संबंधित प्रश्न
Why does the cord of an electric heater not glow while the heating element does?
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
When current is switched ‘on’ in a room heater, it ______.
An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.
Explain why, the current that makes the heater element very hot, only slightly warms the connecting wires leading to the heater.
Which of the following characteristic is not suitable for a fuse wire?
(a) thin and short
(b) thick and short
(c) low melting point
(d) higher resistance than rest of wiring
Identify the figure and give its use.
Find the odd one out and give its explanation.
Name some devices that run using heat effect of electric current
Explain the heating effect of electric current.