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 11
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.
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 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.
If the voltage across a resistor is doubled, what happens to the current through the resistor (assuming temperature is constant)?
(1) It halves
(2) It doubles
(3) It remains the same
(4) It becomes zero
Which of the following devices is most likely to obey Ohm’s Law?
(1) Diode
(2) Filament lamp
(3) Metal wire
(4) Thermistor
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 limitation of Ohm’s Law?
(1) It does not apply to non-ohmic materials
(2) It is valid only at constant temperature
(3) It applies to all semiconductors
(4) It is not valid for vacuum tubes
Fill in the blank: Materials that obey Ohm’s Law are called _______ conductors.
Fill in the blank: The current through a resistor is 4 A when the voltage across it is 20 V. The resistance is _______ Ω.
Fill in the blank: The graph of current versus voltage for an ohmic conductor is a _______ line.
Fill in the blank: The ratio of voltage to current in a conductor is called _______.
True or False: According to Ohm’s Law, resistance remains constant for all materials regardless of temperature.
True or False: Ohm’s Law is applicable to all electrical devices.
True or False: The graph of voltage versus current for a non-ohmic device is a straight line.
True or False: The resistance of a conductor is independent of its length and cross-sectional area.
