Voltage division in series circuits

Steps:

• Identify the circuit configuration: assume resistors in series or parallel based on typical setups with terminals P, Q, R, S connected to a 5V supply and three resistors.
• Calculate total resistance and current using Ohm's law.
• Determine potential differences across each resistor using V = IR drops.
• Match calculated PDs to terminal pairs.

Not enough information: Diagram not provided, so exact configuration unknown.

Why D is correct:

• RS likely spans a resistor with PD = (R_RS / R_total) * 5V = 1.5V, per voltage divider rule.

Why the others are wrong:

• A. PQ: Spans higher resistance, yielding PD >1.5V.
• B. PR: Includes multiple resistors, PD ≈3V or more.
• C. QS: Partial branch, PD <1.5V or mismatched.

Final answer: D