Voltage Division in Series Circuit

Steps:

• Identify total resistance: two 3 Ω resistors in series give 6 Ω total.
• Calculate total current: I = V/R = 6 V / 6 Ω = 1 A.
• Determine voltage across the resistor with voltmeter: V = I × R = 1 A × 3 Ω = 3 V.
• Confirm voltmeter measures potential difference across that branch.

Why B is correct:

• Voltage divider rule states equal resistors share battery voltage equally, so 6 V battery yields 3 V across each.

Why the others are wrong:

• A: Underestimates by ignoring full current through the measured resistor.
• C: Assumes uneven division, like 3:2 ratio, not present here.
• D: Equals full battery voltage, ignoring series drop across other resistor.

Final answer: B