Advertisements
Advertisements
Question
How does the resistance of a wire depend on its length? Give a reason for your answer.
Advertisements
Solution
Resistance of a wire is directly proportional to the length of the wire.
R ∝ I
The resistance of a conductor depends on the number of collisions which the electrons suffer with the fixed positive ions while moving from one end to the other end of the conductor. Obviously the number of collisions will be more in a longer conductor as compared to a shorter conductor. Therefore, a longer conductor offers more resistance.
APPEARS IN
RELATED QUESTIONS
Assertion (A): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.
Resistance of a wire depends on, ______.
The effective resistance of three resistors connected in series is lesser than the lowest of the individual resistances.
The resistance of a conductor is R. If Its length is doubled, then its new resistance will be ______.
______ is the only non-metal that is a good conductor of electricity.
The process of conduction of electric current through the solution is called ______.
A rheostat is also known as fixed resistance.
Define the following:
Fixed resistor
|
5 bulbs are connected in series in a room. One bulb is fused. It is removed and remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the following physical quantities? (Increases, Decreases, Remain Same). |
- Resistance
- Intensity of light
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
