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 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 5 ohms. If the current through it is 3 A, what is the potential difference across the wire?
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.
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 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?
Which property of a material determines how much it resists the flow of electric current?
