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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
What is the SI unit of (i) electric energy, and (ii) electric power?
Write the formula for electric power in terms of potential difference and current.
Explain why, filament type electric bulbs are not power efficient.
What is the resistance, under normal working conditions of a 240 V electric lamp rated at 60 W? If two such lamps are connected in series across a 240 V mains supply, explain why each one appears less bright.
The diagram 31 shows a 3 terminal plug socket.
(i) What is the purpose of the terminal E?
(ii) To which part of the appliance is the terminal E connected?
(iii) To which wire L or N, is the fuse connected and why?
Name the physical quantity which is measured in kW.
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?
With reference to the diagram shown below calculate:
(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
(iii) The electrical power between P and Q.
A torch bulb is rated at 3 V and 600 mA. Calculate it’s
- power
- resistance
- energy consumed if it is used for 4 hours.
