Electricity Class 10 Notes Physics Science Chapter 12 What are Electricity and Charge? Charge A physical property of a substance which causes it to experience a force when placed near other matter or substances. Unit of electric charge is Coulomb. Like charges repel each other. Unlike charges attract each other. Electricity It is the term used to represent a set of physical phenomenon associated with the presence of electric charge. It is used in our homes for lightning operating fans, heating purpose etc.