Question

1. which material has the greatest resistance?

salt water
wood
copper
aluminum

Explanation:

Resistance is a property that opposes the flow of electric current. Conductors have low resistance, while insulators have high resistance. Copper and aluminum are good conductors (low resistance). Salt water, due to the presence of ions, can conduct electricity (lower resistance compared to an insulator). Wood is an insulator (high resistance as it does not allow easy flow of electric current).

Answer:

wood