Advertisements
Advertisements
प्रश्न
How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
उत्तर
The heat produced is proportional to the square of current passed in the wire.
APPEARS IN
संबंधित प्रश्न
Name two safety devices which are connected to the live wire of a household electric circuit
Define watt-hour. How many joules are equal to 1 watt-hour?
Which uses more energy : a 250 W TV set in 1 hour or a 1200 W toaster in 10 minutes?
An electric heater of resistance 8 Ω takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.
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.
Two resistors A and B of 4 Ω and 6 Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power supplied by the battery.
What is the energy conversion when an electric current passes through a metallic wire?
What is the commercial unit of electrical energy? Represent it in terms of joules.
A conductor of 10 Ω is connected across a 6 V ideal source. The power supplied by the source to the conductor is ______.
A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.
