🔍 Key Concepts
• Use Ohm’s Law: I = V / R to relate current, voltage, and resistance.
• Notice in figure B that R1, R2, and R3 are connected as parallel branches, not in series.
• In a parallel circuit, each branch has the same voltage across it, equal to the source voltage.
💭 Think About
• From the drawing, does current going through R1 also have to pass through R2 and R3, or can it choose separate paths? What does that say about series vs. parallel?
• Once you decide the type of connection, what is the voltage across R1? How does that compare to the battery voltage?
• Given that voltage and the resistance of R1, what does Ohm’s Law tell you about the current through just that one branch?
✅ Before You Answer
• Confirm that R1, R2, and R3 are each connected directly across the same two nodes (a sign of parallel connection).
• Be sure you are calculating only the current in R1, not the total current from the battery.
• Use I = V / R with V as the voltage across R1 and R as 2 ohms, and check that your final current value matches one of the choices.