Electrical Resistance and Resistivity
Physics ⇒ Electricity and Magnetism
Electrical Resistance and Resistivity starts at 9 and continues till grade 12.
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A student measures the resistance of a wire at different temperatures and finds that resistance increases with temperature. What type of material is the wire likely made of?
Define resistivity.
Describe how you would experimentally determine the resistivity of a given wire.
Describe the effect of temperature on the resistance of a typical metallic conductor.
A student connects two resistors, 4 Ω and 6 Ω, in series. What is the total resistance?
A student measures the resistance of a wire at different temperatures and finds that resistance increases with temperature. What type of material is the wire likely made of?
A 10 m long wire has a resistance of 2 Ω. If another wire of the same material has a length of 20 m and a cross-sectional area twice as large, what is its resistance?
A copper wire and an aluminum wire have the same length and resistance. If the resistivity of copper is lower than that of aluminum, which wire has a greater cross-sectional area?
If the cross-sectional area of a wire is doubled, what happens to its resistance, assuming length and material remain constant? (1) It doubles (2) It halves (3) It remains the same (4) It becomes zero
Which of the following does NOT affect the resistance of a wire? (1) Length (2) Material (3) Temperature (4) Frequency of current
Which of the following is a unit of resistivity? (1) Ω m (2) Ω / m (3) Ω m2 (4) Ω / m2
Which of the following is the correct formula for resistance (R) in terms of resistivity (ρ), length (l), and area (A)? (1) R = ρA/l (2) R = l/ρA (3) R = ρl/A (4) R = ρ/lA
The resistance of a conductor is inversely proportional to its ________.
The resistivity of a superconductor at its critical temperature is ________.
The SI unit of electrical resistance is ________.
The resistance of a wire is directly proportional to its ________ and inversely proportional to its ________.
True or False: All materials obey Ohm's Law at all temperatures and voltages.
True or False: The resistance of a wire increases as its length increases, assuming all other factors remain constant.
True or False: The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area.
True or False: The resistivity of a material changes with temperature.
