Electrical Resistance and Resistivity
Physics ⇒ Electricity and Magnetism
Electrical Resistance and Resistivity starts at 9 and continues till grade 12.
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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.
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?
The resistance of a wire depends on which of the following factors?
(1) Length, cross-sectional area, material, and temperature
(2) Only length
(3) Only material
(4) Only temperature
Which material has the lowest resistivity at room temperature?
(1) Silver
(2) Copper
(3) Iron
(4) Nichrome
Which of the following best describes a superconductor?
(1) A material with very high resistance
(2) A material with zero resistivity below a certain temperature
(3) A material with negative resistance
(4) A material with infinite resistivity
Which of the following is a property of an ideal resistor?
(1) Its resistance changes with temperature
(2) It obeys Ohm's Law at all temperatures
(3) It has zero resistance
(4) It is made of a superconductor
The resistance of a conductor is inversely proportional to its _____.
The resistance R of a uniform wire of length l and cross-sectional area A is given by the formula R = _____.
The resistivity of a material is independent of its _____.
The SI unit of resistivity is _____.
State whether the following statement is true or false: Semiconductors have resistivity values between those of conductors and insulators.
True or False: The resistance of an ideal insulator is infinite.
True or False: The resistivity of a material changes with temperature.
