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 12
A 100 W, 220 V electric bulb is used in a country where the mains voltage is 110 V. What will be the power consumed by the bulb?
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 2 Ω at 20°C. If the temperature coefficient of resistance for copper is 0.004/°C, what will be its resistance at 30°C?
A resistor is marked with color bands: red, violet, yellow, and gold. What is its resistance and tolerance?
A wire has a resistance of 5 Ω. If its length is tripled and its cross-sectional area is doubled, what is its new resistance?
A wire of resistance 10 Ω is cut into 5 equal parts. These parts are then connected in parallel. What is the equivalent resistance?
Define electrical resistivity.
Describe how the resistance of a semiconductor changes with temperature.
Describe the difference between resistance and resistivity.
Explain why alloys like nichrome are preferred over pure metals for making standard resistors.
Explain why the resistance of a metallic conductor increases with temperature.
If a wire of resistance R is bent into a circle, what is the resistance between two diametrically opposite points?
If the length of a wire is doubled and its cross-sectional area is halved, by what factor does its resistance change?
If the resistivity of a material is 1.6 × 10-8 Ω m, what is the resistance of a wire of length 2 m and cross-sectional area 1 × 10-6 m2?
State Ohm's Law.
The resistance of a wire at 0°C is 100 Ω. If its temperature coefficient of resistance is 0.005/°C, what is its resistance at 100°C?
