Advertisements
Advertisements
Question
State three factors on which the resistance of a wire depends. Explain how the resistance depends on the factors stated by you.
Advertisements
Solution
Resistance of a wire depends upon:
(i) Length of wire: Resistance is directly proportional to the length of a wire.
(ii) Area of cross-section of wire: Resistance is inversely proportional to the area of cross-section the wire.
(iii) The temperature of wire: Resistance of a wire is directly proportional to the temperature of the wire.
APPEARS IN
RELATED QUESTIONS
State and define the S.I. unit of potential difference.
How is the current flowing in a conductor changed if the resistance of conductor is doubled keeping the potential difference across it the same?
State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
Name the physical quantity of which the unit is ohm
In transferring 1.5 C charge through a wire, 9 J of work is needed. Find the potential difference across the wire.
There is a positively charged sphere A and negatively charged sphere B, such that they are brought in electrical contact by a copper wire.
Which sphere is at higher potential before electrical contact on the basis of convention?
Draw a diagram showing two bulbs connected in parallel to a dry cell.
State the kind of charge on a negative ion.
