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 10
A copper wire and an iron wire of the same length and cross-sectional area are connected to the same voltage. Which wire will have a higher current?
Define resistivity.
Describe the effect of temperature on the resistance of a semiconductor.
Explain why alloys like nichrome are used for making heating elements.
A 100 W, 220 V electric bulb is used in a circuit. Calculate its resistance.
A 5 m long wire has a resistance of 10 Ω. What will be its resistance if it is stretched to 10 m, assuming its volume remains constant?
A copper wire and an iron wire of the same length and cross-sectional area are connected to the same voltage. Which wire will have a higher current?
A student connects three resistors of 2 Ω, 3 Ω, and 6 Ω in parallel. What is the total resistance?
Which of the following factors does NOT affect the resistance of a wire?
(1) Length
(2) Material
(3) Color
(4) Cross-sectional area
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.
Which of the following is the correct formula for resistance?
(1) R = V/I
(2) R = I/V
(3) R = V × I
(4) R = V + I
Which of the following materials has the lowest resistivity?
(1) Silver
(2) Iron
(3) Nichrome
(4) Glass
The resistance of a conductor depends on its ________, cross-sectional area, material, and temperature.
The SI unit of electrical resistance is ________.
The unit of resistivity is ________.
If the resistance of a wire is R at 0°C and Rt at t°C, the relationship between Rt and R is given by Rt = R(1 + αt), where α is the ________ of resistance.
The resistance of a wire is doubled when its length is doubled and its cross-sectional area is halved. True or False?
True or False: All materials obey Ohm's Law.
True or False: The resistance of a wire increases as its length increases.
True or False: The resistivity of a material changes with its shape and size.
