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प्रश्न
Why is heating coil wound in the form of a helix in electric stove?
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उत्तर
This reduces the area over which element of heater is spread. As heat is produced over smaller area, therefore temperature of its element rises to about 1000°C.
संबंधित प्रश्न
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
State the S.I. unit of electrical power.
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
An electric current is passed through a metallic wire. The wire gets heated up. Give the reason. Is it possible to melt the wire by passing a heavy current?
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.
An Electric bulb is marked 100 W, 230 V. What current does it take?
