Answer:
Electrons
Step-by-step explanation:
Generally speaking, electricity is known as the flow of charged particles, which could be either protons or electrons, but almost always electrons due to them being significantly easier to transfer between molecules. So, for the purpose of this question refer to the definition of electricity as the flow of electrons.
When we plug in cords, the electricity we gain to charge our phones or power our computers comes from electrons that originate at a power station that then travel along transmission lines and power lines before eventually reaching our homes, from where we can access them through our outlets.