Advertisements
Advertisements
Question
Which among iron and mercury is a better conductor of electricity?
Advertisements
Solution
Iron is a better conductor of electricity than mercury because the resistivity of iron is less than that of mercury.
APPEARS IN
RELATED QUESTIONS
On what factors does the resistance of a conductor depend?
What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?
List the factors on which the resistance of a conductor in the shape of a wire depends.
Why are alloys commonly used in electrical heating devices? Give reason.
Fill in the following blanks with suitable words:
Copper is a good .......... Plastic is an ..........
What is the general name of the substances having infinitely high electrical resistance?
Which has less electrical resistance : a thin wire or a thick wire (of the same length and same material)?
What is meant by the "resistance of a conductor" ? Write the relation between resistance, potential difference and current.
What happens to the resistance as the conductor is made thinner?
What happens to the resistance as the conductor is made thicker?
Which has more resistance:
a long piece of nichrome wire or a short one?
A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Calculate the resistivity of its material?
What would be the effect on the resistance of a metal wire of:
increasing its length?
How does the resistance of a wire change when:
its material is changed to one whose resistivity is three times?
Calculate the area of cross-section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6 Ω m.
The figure blow shows a variable resistor in a dimmer switch.
How would you turn the switch to make the lights: (a) brighter, and (b) dimmer? Explain your answer.
Materials which allow larger currents to flow through them are called:
Assertion: Conductors allow the current to flow through themselves.
Reason: They have free charge carriers.
