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 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 resistor of 20 Ω is connected in series with another resistor of 30 Ω. What is the total resistance?
A student connects three resistors of 2 Ω, 3 Ω, and 6 Ω in parallel. What is the total resistance?
A wire has a resistance of 5 Ω at 20°C. If its temperature coefficient of resistance is 0.004/°C, what will be its resistance at 30°C?
A wire of length 2 m and cross-sectional area 0.5 mm² has a resistance of 8 Ω. Calculate the resistivity of the material.
Define resistivity.
Describe the effect of temperature on the resistance of a semiconductor.
Explain why alloys like nichrome are used for making heating elements.
Explain why thick wires have less resistance than thin wires of the same material and length.
If a wire has a resistance of 4 Ω, what is the current when a voltage of 12 V is applied across it?
If the cross-sectional area of a wire is doubled, what happens to its resistance (assuming length and material remain the same)?
If the resistance of a conductor is 10 Ω and the current flowing through it is 2 A, what is the potential difference across it?
State Ohm's Law.
What happens to the resistance of most metals as temperature increases?
What is the resistance of a 2 m long wire with a cross-sectional area of 1 mm² and resistivity 1.7 × 10⁻⁸ Ω·m?
Which arrangement gives a lower total resistance: two resistors in series or in parallel?
A circuit contains two resistors, R1 = 10 Ω and R2 = 20 Ω, connected in parallel. If the total current supplied by the battery is 6 A, calculate the current through each resistor.
A cylindrical wire of length L and radius r has a resistance R. If both the length and radius are doubled, what will be the new resistance of the wire?
