Electrical resistance Quiz Practice Quiz…

Q: Which of the following factors does NOT directly affect the resistance of a metallic conductor?

The applied voltage — Resistance depends on material, length, and area, but not the applied voltage itself (though voltage affects current).

Q: If the length of a wire is doubled and its cross-sectional area is halved, what happens to its resistance (assuming constant material and temperature)?

It quadruples — Resistance is proportional to length and inversely proportional to area. Doubling length doubles resistance; halving area doubles it again, for a total of quadrupling.

Q: What is the unit of measurement for electrical resistivity?

Ohm-meters (??m) — Resistivity is the intrinsic property of a material, expressed in ohm-meters.

Q: Which statement best describes the temperature coefficient of resistance for a typical metal?

It is positive, and resistance increases with increasing temperature. — Metals generally have a positive temperature coefficient; their resistance increases as temperature rises.

Q: What is the resistance of a 100-meter long copper wire with a cross-sectional area of 1 mm² if the resistivity of copper is approximately 1.7 x 10^-8 ??m?

1.7 ? — Use R = ?L/A. Convert area to meters squared. R = (1.7 x 10^-8 ??m * 100 m) / (1 x 10^-6 m²) ? 1.7 ?

Question 1 of 5

Which of the following factors does NOT directly affect the resistance of a metallic conductor?

Resistance depends on material, length, and area, but not the applied voltage itself (though voltage affects current).

Question 2 of 5

If the length of a wire is doubled and its cross-sectional area is halved, what happens to its resistance (assuming constant material and temperature)?

Resistance is proportional to length and inversely proportional to area. Doubling length doubles resistance; halving area doubles it again, for a total of quadrupling.

Question 3 of 5

What is the unit of measurement for electrical resistivity?

Resistivity is the intrinsic property of a material, expressed in ohm-meters.

Question 4 of 5

Which statement best describes the temperature coefficient of resistance for a typical metal?

Metals generally have a positive temperature coefficient; their resistance increases as temperature rises.

Question 5 of 5

What is the resistance of a 100-meter long copper wire with a cross-sectional area of 1 mm² if the resistivity of copper is approximately 1.7 x 10^-8 ??m?

Use R = ?L/A. Convert area to meters squared. R = (1.7 x 10^-8 ??m * 100 m) / (1 x 10^-6 m²) ? 1.7 ?

Electrical resistance Quiz