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 resistor of 20 Ω is connected in series with another resistor of 30 Ω. What is the total resistance?
Describe the effect of temperature on the resistance of a semiconductor.
Explain why alloys like nichrome are used for making heating elements.
State Ohm's Law.
What happens to the resistance of most metals as temperature increases?
Which arrangement gives a lower total resistance: two resistors in series or in parallel?
