Advertisements
Advertisements
Question
How does the resistance of a pure metal change if its temperature decreases?
Advertisements
Solution
The resistance of all pure metals increases on raising the temperature and decreases on lowering the temperature. Therefore, the resistance of a pure metal will decrease on decreasing the temperature.
APPEARS IN
RELATED QUESTIONS
Find the expression for resistors connected in series.
Write any two characteristics of a series combination of resistors.
The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
V = IRTwo resistances X and Y are connected turn by turn : (i) in parallel, and (ii) series. In which case the resultant resistance will be less than either of the individual resistances?R = R1+ R2+ R3
What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?
4 Ω, 8 Ω, 12 Ω, 24 Ω
Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4
Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be ______.
How does the resistance of an alloy, vary with temperature?
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
How does the resistivity of an alloy such as constantace depends on temperature.
State expression for Resistance connected in series.
What is the equivalent resistance between the points X and Y for the given network?
When a 4 Ω resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is:
