Advertisements
Advertisements
प्रश्न
What changes in energy occur in an electric bulb?
Advertisements
उत्तर
In an electric bulb, electrical energy changes to heat and light energy.
संबंधित प्रश्न
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
What is the maximum power in kilowatts of the appliance that can be connected safely to a 13 A ; 230 V mains socket?
The diagram below shows a magnetic kept just below the conductor AB which is kept in North South direction.
(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.
What is the current I in the given circuit (Fig. )?
Point out two main disadvantages of ‘Tree System’.
State two advantages of filling an inert gas in an evacuated electric filament lamp.
A device is used to transform 12 V a.c. to 200 V a.c. What is the name of this device? Name the principle on which it works.
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
A cooler of 1500 W, 200 volts and a fan of 500 W, 200 volts are to be used from a household supply. The rating of fuse to be used is:
