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 11
A 2 m long wire has a resistance of 4 Ω. What will be the resistance of a 6 m long wire of the same material and thickness?
A copper wire has a resistance of 5 Ω. If the length of the wire is doubled and the cross-sectional area is halved, what will be the new resistance?
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 wire has a resistance of 10 Ω at 20°C. If the temperature coefficient of resistance is 0.004/°C, what will be its resistance at 30°C?
A wire has a resistance of 6 Ω at 20°C. If the temperature coefficient is 0.003/°C, what is its resistance at 70°C?
A wire of resistance 8 Ω is bent into a circle. What is the resistance between two diametrically opposite points?
Calculate the resistance of a 3 m long copper wire with a cross-sectional area of 2 × 10-6 m2 and resistivity 1.7 × 10-8 Ω m.
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.
Explain why metals are good conductors of electricity in terms of resistance and resistivity.
Explain why the resistance of an insulator is much higher than that of a conductor.
If a wire of resistance R is cut into three equal pieces and these pieces are connected in parallel, what is the equivalent resistance?
State Ohm's Law.
State the relationship between resistance and temperature for a semiconductor.
The resistance of a wire is 15 Ω at 0°C and 18 Ω at 100°C. Calculate the temperature coefficient of resistance.
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?
A cylindrical wire made of material X has a length of 1.5 m and a cross-sectional area of 1.2 × 10-6 m2. If the resistivity of X is 2.0 × 10-7 Ω m, calculate the resistance of the wire.
