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प्रश्न
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उत्तर
(a) Primary cells cannot be charged again while secondary cells can be charged again and again.
(b) In primary cells, a chemical reaction is irreversible while in secondary cells, a chemical reaction is reversible.
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संबंधित प्रश्न
Name one D.C. source and one A.C. source.
What is a primary cell?
The unit of current is :
State and define the S.I. unit of resistance.
Current in a circuit flows :
Draw a diagram showing two bulbs connected in series to a dry cell.
The following figure shows a metal rod PQ mounted on an insulated stand. The cap of an uncharged electroscope touches one end Q of the metal rod. A negatively charged ebonite rod is brought near the other end P of the metal rod.
(a) What charge does the end P have?
(b) What charge does the end Q have?
(c) What charge does the cap of the electroscope have?
(d) What charge does the gold leaf have?
(e) Will the leaf diverge or collapse? Give reason.
(f) If the electroscope is now earthed, what charge does the metal rod have?
State the factors on which the electrical resistance of a wire depends.
