subject

Ohm’s Law

Physics ⇒ Electricity and Magnetism

Ohm’s Law starts at 8 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Ohm’s Law. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A 60 W, 120 V light bulb is connected to a 120 V supply. What is the resistance of the bulb when operating at rated voltage?
A 9 V battery is connected across a resistor, and a current of 0.3 A flows. Calculate the resistance of the resistor.
A resistor has a resistance of 20 Ω. What current will flow if a potential difference of 100 V is applied across it?
A resistor is marked 220 Ω. If a current of 0.5 A flows through it, what is the voltage across the resistor?
A student connects a 12 V battery across a resistor and measures a current of 3 A. What is the resistance of the resistor?
A student measures the current through a resistor for different applied voltages and finds that the current is not proportional to the voltage. What can be concluded about the resistor?
A wire has a resistance of 4 Ω. If the current passing through it is 2 A, what is the potential difference across the wire?
Describe one practical application of Ohm’s Law in electrical circuits.
Describe the limitations of Ohm’s Law.
Explain why Ohm’s Law does not apply to a filament lamp at high voltages.
Explain why Ohm’s Law is considered a fundamental law in electrical engineering.
If a conductor has a resistance of 15 Ω and a current of 0.2 A flows through it, what is the voltage across the conductor?
If a resistor has a resistance of 10 Ω and a voltage of 5 V is applied across it, what is the current flowing through the resistor?
If the current through a resistor is 2 A when a voltage of 10 V is applied, what is the resistance?
If the voltage across a resistor is tripled, what happens to the current through the resistor, assuming the resistance remains constant?
State Ohm’s Law and write its mathematical expression.