Electrical Resistance and Resistivity
Physics ⇒ Electricity and Magnetism
Electrical Resistance and Resistivity starts at 9 and continues till grade 12.
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See sample questions for grade 9
A copper wire and an iron wire have the same length and cross-sectional area. Which one has lower resistance?
Define resistivity.
Describe the relationship between resistance and current in a circuit, according to Ohm's Law.
Explain why resistance is important in electrical circuits.
A 3 m long wire of cross-sectional area 2 × 10-6 m² has a resistivity of 2 × 10-7 Ω·m. Calculate its resistance.
A student connects a 6 V battery to a resistor and measures a current of 0.5 A. What is the resistance of the resistor?
A wire has a resistance of 20 ohms. If the cross-sectional area is doubled, what will be the new resistance?
A wire of resistivity 1.7 × 10-8 Ω·m, length 2 m, and area 1 × 10-6 m² is used. Calculate its resistance.
Which of the following factors does NOT affect the resistance of a wire?
(1) Length
(2) Material
(3) Color
(4) Temperature
Which of the following has the highest resistivity?
(1) Silver
(2) Copper
(3) Glass
(4) Aluminum
Which of the following is NOT a unit of resistance?
(1) Ohm
(2) Ω
(3) Volt
(4) 1 A/V
Which of the following is the correct unit for resistivity?
(1) ohm-meter
(2) ohm/ampere
(3) ampere/volt
(4) volt/ohm
If a material has high resistivity, it is likely to be a ________.
The formula for resistance in terms of resistivity is R = ________ × (L/A).
The resistance of a wire is directly proportional to its ________.
The resistance of a wire is inversely proportional to its ________.
True or False: All materials have the same resistivity.
True or False: Increasing the temperature of a metallic conductor increases its resistance.
True or False: Superconductors have zero resistance at very low temperatures.
True or False: The resistance of a semiconductor decreases as temperature increases.
