Resistance from I-V slope at fixed voltage

Steps:

• Resistance R equals V divided by I for any component.
• At fixed potential difference V, greatest R means smallest current I.
• Compare I values from the I-V graphs at voltage V.
• Graph D has the lowest I at V.

Why D is correct:

• By Ohm's law, R = V/I; D's minimal I yields maximal R.

Why the others are wrong:

• A: Higher I at V gives lower R than D.
• B: Even higher I at V results in smaller R.
• C: Moderate I at V leads to intermediate R, still less than D's.

Final answer: D