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 12
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?
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.
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 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?
Which of the following devices is designed to obey Ohm’s Law as closely as possible?
(1) Light Emitting Diode (LED)
(2) Thermistor
(3) Metal wire resistor
(4) Filament lamp
Which of the following graphs best represents Ohm’s Law for an ohmic conductor?
(1) A straight line passing through the origin
(2) A parabola
(3) A horizontal line
(4) A vertical line
Which of the following is NOT a condition for Ohm’s Law to be valid?
(1) Constant temperature
(2) Constant physical state
(3) High frequency alternating current
(4) Metallic conductor
Which of the following is NOT an ohmic device?
(1) Carbon resistor
(2) Copper wire
(3) Diode
(4) Nichrome wire
Fill in the blank: According to Ohm’s Law, if the resistance is doubled and the voltage remains constant, the current will be ________.
Fill in the blank: The reciprocal of resistance is called ________.
Fill in the blank: The slope of the V-I graph for an ohmic conductor represents ________.
The SI unit of resistance is ________.
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 is valid for all materials, including semiconductors and electrolytes.
True or False: The resistance of a conductor depends on its material, length, and cross-sectional area.
True or False: The resistance of a metallic conductor increases with an increase in temperature.
