Practice - Ohm’s Law and Resistivity
Practice Questions
Test your understanding with targeted questions
What is the formula for Ohm's Law?
💡 Hint: Remember the three variables: voltage, current, and resistance.
If the resistance is 5 Ω and the current is 2 A, what is the voltage?
💡 Hint: Use Ohm's formula to find voltage.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does Ohm's Law state?
💡 Hint: Remember the relationship defined by the formula.
True or False: Higher resistivity means a material is a better conductor.
💡 Hint: Think about how resistance works.
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Challenge Problems
Push your limits with advanced challenges
A resistive heater made of nichrome wire has a resistivity of 1.10 × 10⁻⁶ Ω·m. If the wire is 5 m long and has a cross-sectional area of 2 × 10⁻⁶ m², calculate the resistance of the wire.
💡 Hint: Understand the relationship between resistivity, length, and cross-sectional area.
If a 12 V battery connected to a resistor of 4 Ω is used, what is the current through the resistor? Then find out the total energy dissipated in the resistor in 10 seconds.
💡 Hint: Determine first the current, and then use the power formula.
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Reference links
Supplementary resources to enhance your learning experience.