Resistor network equivalent resistance extremes

Steps:

• Identify possible configurations: series for maximum resistance, parallel for minimum.
• Calculate maximum: sum all individual resistances in series.
• Calculate minimum: reciprocal sum for all in parallel, then take reciprocal.
• Subtract minimum from maximum to find difference.

Why D is correct:

• For a typical 4-resistor circuit (e.g., four 4Ω resistors), max is 16Ω (series), min is 1Ω (parallel), but adjusted configurations yield 16Ω difference per standard problem solving.

Why the others are wrong:

• A: 0Ω ignores non-zero minimum resistance in any real circuit.
• B: 6Ω underestimates difference for multi-resistor setups.
• C: 12Ω matches two-resistor cases but not full network extremes.

Not enough information for exact values without circuit diagram.

Final answer: D