Ohm’s Law
Physics ⇒ Electricity and Magnetism
Ohm’s Law starts at 8 and continues till grade 12.
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See sample questions for grade 10
Describe a practical application of Ohm’s Law in everyday life.
Describe what is meant by an ‘ohmic’ conductor.
Explain why a filament lamp does not obey Ohm’s Law at high voltages.
Explain why semiconductors do not obey Ohm’s Law.
A circuit has a current of 4 A and a resistance of 2 Ω. What is the voltage across the circuit?
A circuit has a resistance of 5 Ω and a voltage of 10 V. Calculate the current flowing through the circuit.
A resistor has a resistance of 20 Ω. If a voltage of 100 V is applied, what is the current?
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?
Which of the following devices is used to measure current in a circuit?
(1) Voltmeter
(2) Ammeter
(3) Ohmmeter
(4) Thermometer
Which of the following equations correctly represents Ohm’s Law?
(1) V = IR
(2) I = VR
(3) R = VI
(4) V = I/R
Which of the following is NOT a condition for Ohm’s Law to be valid?
(1) Constant temperature
(2) Constant resistance
(3) Constant voltage
(4) Constant physical conditions
Which of the following is the correct symbol for ohm?
(1) O
(2) Ω
(3) A
(4) V
Fill in the blank: According to Ohm’s Law, R = ________.
Fill in the blank: The current through a conductor is ________ proportional to the voltage across it, according to Ohm’s Law.
Fill in the blank: The graph of voltage versus current for an ohmic conductor is a ________ line.
Fill in the blank: The SI unit of electric current is ________.
True or False: According to Ohm’s Law, if the resistance in a circuit is doubled and the voltage remains the same, the current will be halved.
True or False: All materials obey Ohm’s Law at all temperatures.
True or False: Ohm’s Law can be used to calculate the resistance of a component if the voltage and current are known.
True or False: The resistance of a conductor depends on its material, length, and cross-sectional area.
