Which definition is correct and uses only quantities rather than units? a. density is mass per unit volume b. potential difference is energy per unit current c. pressure is force per unit area d. speed is distance travelled per second

Option (A), (C) and (D)

Explanation:

Density is defined as the ratio of mass of substance to the volume of substance.

Potential difference is equal to the product of current and the resistance.

Pressure is defined as the thrust acting per unit area.

Speed is defined as the distance traveled in one second.