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 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?
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.
State Ohm's Law.
State the relationship between resistance and temperature for a semiconductor.
Explain why the resistance of a metallic conductor increases with temperature, while the resistance of a semiconductor decreases with temperature.
