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प्रश्न
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
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उत्तर
At the generating station the electric power is generated at 11,000 volt. This voltage is alternating of frequency 50 Hz. To transmit this power to our house the alternating voltage generated at the generating station is first stepped up from 11,000 V to 1,32,000 V. It is then transmitted to the main sub-station through the high-tension line wires, where it is stepped down to 3,300 V and then transmitted to the city sub-station. At the city sub-station, the voltage is further stepped down to 220 V for supply to the houses through the overhead line wires.
संबंधित प्रश्न
If a bulb of 60W is connected across a source of 220V, find the current drawn by it.
Define watt. Write down an equation linking watts, volts and amperes.
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(a) 500°C
(b) 1500°C
(c) 2500°C
(d) 4500°C
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When a current I flows through a resistance R for time t, the electrical energy spent is given by:
(a) IRt (b) I²Rt (c) `IR^2t` (d) `I^2R ⁄t`
Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their
resistances
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(i) In which direction will the needle deflect when the key is closed ?
(ii) Why is the deflection produced ?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.
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(ii) Held at rest inside the coil?
(iii) Pulled out again?
What is ‘Rating’ of an electric appliance?
With reference to the diagram shown below calculate:
(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
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