Electric charge and Positive charge

Electric charge noun - The quantity of unbalanced electricity in a body (either positive or negative) and construed as an excess or deficiency of electrons.

Positive charge and electric charge are semantically related. In some cases you can replace phrase "Positive charge" with "Electric charge", this phrases are similar.

Positive charge noun - Having a deficiency of electrons; having a higher electric potential.

Electric charge and positive charge are semantically related. You can use "Electric charge" instead a noun phrase "Positive charge".