Can anyone ans this ..
with explanation

Which statement best describes resistance? resistance is a. how well a current will flow in a material and is measured in volts. b. how well a material conducts an electrical charge and is measured in ohms. c. the ability of a material to attract a positive charge to create a current. d. the ability of a material to repel neutral charges and is measured in ohms.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?