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 9
A 2 m long wire has a resistance of 8 ohms. What will be the resistance if the wire is cut into two equal pieces?
A 3 m long wire of cross-sectional area 2 × 10-6 m² has a resistivity of 2 × 10-7 Ω·m. Calculate its resistance.
A copper wire and an iron wire have the same length and cross-sectional area. Which one has lower resistance?
A student connects a 6 V battery to a resistor and measures a current of 0.5 A. What is the resistance of the resistor?
A wire has a resistance of 20 ohms. If the cross-sectional area is doubled, what will be the new resistance?
A wire has a resistance of 5 ohms. If the current through it is 3 A, what is the potential difference across the wire?
A wire of resistivity 1.7 × 10-8 Ω·m, length 2 m, and area 1 × 10-6 m² is used. Calculate its resistance.
Define resistivity.
Describe the relationship between resistance and current in a circuit, according to Ohm's Law.
Explain why resistance is important in electrical circuits.
Explain why the resistance of a wire increases when it is heated.
Explain why thick wires have less resistance than thin wires of the same material and length.
If a wire has a resistance of 10 ohms and a current of 2 amperes flows through it, what is the voltage across the wire?
If the length of a wire is doubled and its cross-sectional area is halved, by what factor does its resistance change?
If the resistance of a wire is 12 ohms at 20°C and increases to 15 ohms at 60°C, what is the effect of temperature on resistance?
If two resistors of 4 ohms and 6 ohms are connected in parallel, what is their total resistance?
If two resistors of 4 ohms and 6 ohms are connected in series, what is their total resistance?
Name one factor that affects the resistivity of a material.
State Ohm's Law.
What is electrical resistance?
