Resistance and resistivity

Front

What happens to the resistance of a wire when the area of cross-section is doubled, keeping the length the same?

Back

The resistance is halved.

Front

What is the unit of resistivity?

Back

Ω.m

Front

What happens to the resistance of a conductor when the temperature is increased?

Back

The resistance increases.

Front

What are the factors affecting the resistance of a conductor?

Back

Length, area of cross-section, and nature of the material.

Front

What is resistivity?

Back

A property of the material that does not change with the length of the conductor.

Front

How does the length of a wire affect its resistance?

Back

Resistance is directly proportional to the length of the wire.

Front

How does the area of cross-section affect the resistance of a wire?

Back

Resistance is inversely proportional to the area of cross-section.

Front

What is the relationship between temperature and resistivity in conductors?

Back

As temperature increases, resistivity generally increases.

Front

What is the formula for calculating resistance?

Back

R = ρ(L/A), where R is resistance, ρ is resistivity, L is length, and A is area.

Front

What is the effect of material type on resistance?

Back

Different materials have different resistivities, affecting their resistance.