Which material provides resistance to the flow of electrons?

Question

A. Silver
B. Saltwater
C. Salt crystals
D. Copper

A circuit has a resistance of 50.0 ohms. What is the voltage needed to generate a current of 0.02 amps?
A. 100 volts
B. 2,500 volts
C. 0.0004 volts
D. 1.00 volt

What is the effect of doubling the resistance of a circuit on the current in the circuit?
A. The current remains the same.
B. The current is reduced by half.
C. The current is doubled.
D. The current is four times greater.

Answer 1

I read my chapters and studied but this specific information was nowhere to be found ):

Answer 2

every material has resistivity but dry salt crystals are the best you listed.

V = i * R

i = V/R

Answer 3

1. Salt Crystals
2. 1.00 volt
3. the current is reduced by half

Answer 4

uhgitsyanna is 100% correct. The other answers are
1. Insulator
5. 0.8

Answer 5

for honors:
5. series