What is the difference between active and passive transport across the plasma membrane?

Passive is when materials travel or move across some cell membranes that doesn't use cell energy. 

Active is the meaning of a movement that crosses across some cell membranes that requires the use of cell energy.

The answer is that passive doesn't use cell energy but active uses cell energy.
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Ihate school can u relate

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.