Copper and Silicon are cooled from 300 K to 60 K . The specific resistance

decreases in copper but increases in silicon

increases in copper but decreases in silicon

MEDIUM

Earn 100

At room temperature $(27 ° C)$ , the resistance of a heating element is $100 Ω$ . What is the temperature of the element if the resistance is found to be $117 Ω,$ given that the temperature coefficient of the material of resistance is $1.70 \times 10^{- 4} C^{- 1}$ .

Important Questions on Current Electricity

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

$I$ and $V$ are respectively the current and voltage in a metal wire of resistance $R .$ The $I - V$ graph for the two different temperatures $T_{1}$ and $T_{2}$ are given, then

Question Image

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The resistance of a wire at

20 ° C

20 Ω

and

500 ° C

60 Ω

. At which temperature, its resistance will be

25 Ω ?

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

A piece of copper and another of germanium are cooled from room temperature to

77 ° K .

The resistance of

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The resistance of the platinum wire of a platinum resistance thermometer at the ice point is

5 Ω

and at steam point is

5.23 Ω

. When the thermometer is inserted in a hot bath, the resistance of the platinum wire will be

5.795 Ω

. Calculate the temperature of the bath.

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The conductivity of semiconductor increases with increase in temperature because

HARD

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The resistance of a conductor at

15 ° C

16 Ω

and at

100 ° C

20 Ω .

What will be the temperature coefficient of resistance of the conductor?

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The temperature co-efficient of resistance of a wire is

0.00125 / ° C .

Its resistance is

1 Ω

300 K .

At what temperature, its resistance will be

2 Ω

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Copper and Silicon are cooled from

300 K

60 K

. The specific resistance

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

In a platinum resistance thermometer, the resistances of the wire at ice point and steam point are of

4 Ω

and

4.25 Ω

respectively. When the thermometer is kept in a hot water bath, whose temperature is not known, the resistance of the wire is found to be

4.5 Ω .

The temperature of the hot water bath is

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Which of the following graph represents the variation of resistivity

(ρ)

with temperature

(T)

for copper?

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

What will be the resistance of a wire at 0 degree celsius, if its resistance is

5 ohm

50

degree celsius and

6 ohm

100

degree celsius?

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The temperature dependence of resistance of

Cu

and undoped

Si

in the temperature range

300 - 400 K

is best described by

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The temperature

(T)

dependence of resistivity

(ρ)

of a semiconductor is represented by

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

When the temperature of a conductor increases, the ratio of conductivity and resistivity _____

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Constantan wire is used in making standard resistances because its

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.

Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.

In the light of the above statements, choose the correct answer from the options given below.

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Resistance of the wire is measured as

2 Ω

and

3 Ω

10 ° C

and

30 ° C

respectively. Temperature coefficient of resistance of the material of the wire is

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The solids which have the negative temperature coefficient of resistance are:

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.

Question Image

One may conclude that

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

A heating element has a resistance of

100 Ω

at room temperature. When it is connected to a supply of

220 V

, a steady current of

2 A

passes in it and temperature is

500^{o} C

more than the room temperature. The temperature coefficient of resistance of the heating element is

At room temperature 27° C, the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature coefficient of the material of resistance is 1.70×10-4 C-1.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

At room temperature $(27 ° C)$ , the resistance of a heating element is $100 Ω$ . What is the temperature of the element if the resistance is found to be $117 Ω,$ given that the temperature coefficient of the material of resistance is $1.70 \times 10^{- 4} C^{- 1}$ .