Circuits Practice — Ohm's Law, Series and Parallel
10 problems · instant feedback · full explanations
Circuit problems are accounting problems: track voltage drops and current splits. Draw the circuit, label what you know, and remember that series shares current while parallel shares voltage.
Q1.
A 12 V battery is connected across a 4 Ω resistor. What current flows?
Multiple choice · Easy
Q2.
A current of 2 A flows through a 10 Ω resistor. What is the voltage across it?
Numerical answer (V) · Easy
Q3.
A 60 W light bulb operates on 120 V. What current does it draw?
Numerical answer (A) · Medium
Q4.
A 2 Ω and a 3 Ω resistor are connected in series. What is the equivalent resistance?
Multiple choice · Medium
Q5.
Two 6 Ω resistors are connected in parallel. What is the equivalent resistance?
Multiple choice · Medium
Q6.
A 4 Ω and a 12 Ω resistor are connected in parallel. What is the equivalent resistance?
Numerical answer (Ω) · Medium
Q7.
True or false: the current is the same through every component in a series circuit.
True / False · Easy
Q8.
A 1500 W space heater runs on 120 V. What is the resistance of its heating element?
Numerical answer (Ω) · Hard
Q9.
Two identical bulbs are wired in series across a battery; another identical pair is wired in parallel across an identical battery. Which pair glows brighter?
Multiple choice · Hard
Q10.
True or false: the voltage is the same across each branch of a parallel circuit.
True / False · Medium