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 9
A student increases the voltage across a resistor and observes that the current also increases proportionally. What does this indicate about the resistor?
Describe what happens to the current if the voltage is kept constant and the resistance is increased.
Describe what is meant by an ‘ohmic’ conductor.
Explain why metals are generally good conductors in terms of Ohm’s Law.
A 6 V battery is connected to a resistor and a current of 0.5 A flows. What is the resistance?
A circuit has a resistance of 50 Ω and a current of 0.2 A. What is the voltage across the circuit?
A circuit has a voltage of 24 V and a resistance of 8 Ω. What is the current?
A resistor has a resistance of 20 Ω. If a current of 0.5 A flows through it, what is the voltage across it?
Ohm’s Law is applicable to which type of materials?
(1) Ohmic conductors
(2) Non-ohmic conductors
(3) Insulators
(4) Semiconductors
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 = I/R
(2) V = IR
(3) I = VR
(4) R = V + I
Which of the following graphs represents Ohm’s Law?
(1) A straight line passing through the origin
(2) A curve
(3) A horizontal line
(4) A vertical line
Fill in the blank: If the current through a resistor is doubled, the voltage across it will _______.
Fill in the blank: The current in a circuit is measured in _______.
Fill in the blank: The formula to calculate resistance using Ohm’s Law is R = _______.
Fill in the blank: The graph of current versus voltage for an ohmic conductor is a _______ line.
State whether the following statement is true or false: The resistance of a conductor depends on its length, area, and material.
True or False: According to Ohm’s Law, resistance remains constant if temperature is constant.
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: Ohm’s Law can be used to predict the behavior of all electrical components.
