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प्रश्न
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उत्तर
An electric cell produces electricity from the chemicals stored inside it. When the chemicals in the electric cell are used up, the electric cell stops producing electricity. It has two
terminaIs - positive and negative.
When two or mo re cells are connected together such that the positive terminaI of one cell is connected to the negative terminal of the next cell; such a combination of two or more cells is called a battery. A battery is thus a combination of two or more cells.
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संबंधित प्रश्न
Define watt. Write down an equation linking watts, volts and amperes.
The SI unit of energy is :
(a) joule
(b) coulomb
(c) watt
(d) ohm-metre
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.
Express watt hour and kilowatt hour in joule.
State three factors on which the heat produced in a metallic wire due to passage of current in it depends.
What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?
State (i) the S. I. unit, (ii) the household unit, of electrical energy. How are these units related?
What is the commercial unit of electrical energy?
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.
