Current Electricity
Physics ⇒ Electricity and Magnetism
Current Electricity starts at 8 and continues till grade 12.
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See sample questions for grade 10
A 60 W bulb operates on 120 V. What is the current through the bulb?
A battery supplies a current of 0.5 A for 10 minutes. How much charge flows through the circuit?
A circuit has a total resistance of 10 Ω and a current of 2 A. What is the voltage across the circuit?
A student connects two 6 Ω resistors in parallel. What is the equivalent resistance?
A wire of resistance 5 Ω is cut into two equal parts. What is the resistance of each part?
Context: A circuit contains a battery of 9 V and a resistor of 3 Ω. Calculate the current flowing through the resistor.
Define electric potential difference.
Describe the difference between series and parallel circuits.
Explain why a fuse is used in an electric circuit.
Explain why metals are good conductors of electricity.
If a circuit contains three resistors of 2 Ω, 4 Ω, and 6 Ω connected in series, what is the total resistance?
If the resistance of a wire is doubled and the potential difference remains the same, what happens to the current?
State Ohm's Law.
The potential difference across a resistor is 12 V and the current through it is 3 A. What is the resistance of the resistor?
Which law states that the total current entering a junction is equal to the total current leaving the junction?
A copper wire has a resistance of 8 Ω at 20°C. If the temperature coefficient of resistance for copper is 0.004/°C, what will be the resistance of the wire at 70°C?
Context: A 24 V battery is connected to a circuit with a total resistance of 48 Ω. If the battery is replaced with a 12 V battery, what happens to the current in the circuit?
Context: A student connects three resistors of 2 Ω, 3 Ω, and 6 Ω in parallel to a 12 V battery. Calculate the total current supplied by the battery.
Describe the effect on the total resistance of a parallel circuit if more branches with resistors are added.
Explain how the resistance of a wire changes if both its length and cross-sectional area are doubled.
