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 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?
A resistor has a voltage of 18 V across it and a current of 3 A. What is its resistance?
A student connects a 12 V battery to a resistor and measures a current of 4 A. What is the resistance of the resistor?
A student increases the voltage across a resistor and observes that the current also increases proportionally. What does this indicate about the resistor?
A student measures a current of 0.25 A through a resistor when a voltage of 5 V is applied. What is the resistance?
A wire has a resistance of 5 Ω. If the voltage applied is 15 V, what is the current through the wire?
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.
Explain why Ohm’s Law does not apply to a diode.
Explain why Ohm’s Law is not applicable to a filament lamp at high temperatures.
If a 9 V battery is connected to a 3 Ω resistor, what is the current in the circuit?
If a resistor has a resistance of 10 Ω and a current of 2 A flows through it, what is the voltage across the resistor?
If the resistance in a circuit is halved while the voltage remains constant, what happens to the current?
If the resistance of a component is 0 Ω, what will be the current for any non-zero voltage?
What is Ohm’s Law?
