Advertisements
Advertisements
Question
Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?
Advertisements
Solution
In the above graph, T1 > T2. The straight line A is steeper than line B, which leads us to conclude that the resistance of a the conductor is more at high-temperature T1 than at low-temperature T2. Thus, we can say that the resistance of a conductor increases with an increase in temperature.
APPEARS IN
RELATED QUESTIONS
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
To increase the effective resistance in a circuit, the resistors are connected in _______________ .
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
How does the resistivity of a semiconductor depend on temperature?
2Ω resistor A, 1Ω resistor B and 4Ω resistor C are connected in parallel. The combination is connected across a 2V battery of negligible resistance. Draw the diagram of the arrangement and calculate:
(i) The current in each resistor A and C,
(ii) The current through battery.
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:
