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प्रश्न
The electric bulbs used these days have a coil-coiled filament. State its reason.
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उत्तर
On account of having a coil-coiled filament, the area of spread of tungsten is much and so the heat now produced in a very small area, raises the temperatures to a high degree i.e., 2300°C, producting more bright light.
संबंधित प्रश्न
State two factors on which the electrical energy consumed by an electrical appliance depends.
Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.
How many joules of electrical energy are transferred per second by a 6 V; 0.5 A lamp?
(a) 30 J/s
(b) 12 J/s
(c) 0.83 J/s
(d) 3 J/s
Name the S.I. unit of electrical energy. How is it related to Wh?
What does the unit kilowatt hour measure? Define it.
What would happen and why, to an electric bulb when it is connected across a supply of voltage (i) lower (ii) higher than its proper rating?
Two electric lamps each rating 100 W, 110 V are connected in series to a 220 V power supply and two other electric lamps each of marking 100 W, 220 V are connected in parallel to the same power supply. Will anyone of the two combinations give more light than the other? Give a reason for your answer.
What is the function of the split rings in a d.c. motor?
An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
State (i) the S. I. unit, (ii) the household unit, of electrical energy. How are these units related?
