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 11
A 100 Ω resistor is connected in a circuit. If the current is 0.05 A, what is the voltage across the resistor?
A circuit contains a 20 Ω resistor and a 10 V battery. What is the current in the circuit?
A resistor has a resistance of 10 Ω and a current of 2 A flows through it. What is the voltage across the resistor?
A resistor has a resistance of 50 Ω. If the current through it is 0.2 A, what is the voltage across it?
A resistor is connected to a 9 V battery and the current measured is 0.3 A. Calculate the resistance.
A student connects a 12 V battery to a resistor and measures a current of 0.5 A. What is the resistance of the resistor?
A student increases the voltage across a resistor from 2 V to 6 V. If the resistance is 2 Ω, by how much does the current increase?
A wire has a resistance of 5 Ω. If a voltage of 15 V is applied, calculate the current flowing through the wire.
Describe the relationship between current and voltage for an ohmic conductor.
Describe what is meant by an ohmic conductor.
Explain why Ohm’s Law is not applicable to a filament lamp at high voltages.
Explain why Ohm’s Law is not valid for a diode.
State Ohm’s Law.
A 24 V battery is connected across a parallel combination of two resistors, 8 Ω and 12 Ω. Calculate the total current supplied by the battery using Ohm’s Law.
A copper wire has a resistance of 8 Ω at 20°C. If the temperature coefficient of resistance for copper is 0.004/°C, calculate the resistance of the wire at 70°C, assuming Ohm’s Law is still valid.
A device has a non-linear current-voltage (I-V) characteristic. Can Ohm’s Law be used to determine its resistance at all applied voltages? Explain your answer.
A resistor is marked with a resistance of 47 Ω. If a current of 0.25 A flows through it, what is the power dissipated by the resistor?
A student connects three resistors of 6 Ω, 12 Ω, and 18 Ω in series to a 36 V battery. Using Ohm’s Law, calculate the current flowing through the circuit.
Explain why Ohm’s Law is not valid for a superconductor below its critical temperature.