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प्रश्न
Mention three uses of the carbon arc.
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उत्तर
(i) They are used in light houses.
(ii) They are used in search lights and cinema projection appliances.
(iii) They are used in electric furnace and electric welding.
संबंधित प्रश्न
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.
Calculate the cost of operating a heater of 500 W for 20 hours at the rate of Rs 3.90 per unit.
An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least:
(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
An electric bulb is rated 250 W, 230 V. Calculate:
- the energy consumed in one hour
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
State two advantages of filling an inert gas in an evacuated electric filament lamp.
State relative advantages and disadvantages of ring system of wiring over the tree system.
1 kWh = ______ J.
