Plastic is often used to coat wires because electric charges cannot move through the plastic easily.

______________________ is the amount of work required to move each unit of charge between two points.

_________________________________ are a special class of materials that conduct electric charge better than electrical insulators but not as well as electrical conductors.

Three ways that objects can gain or lose electrons are by ____________________, _______________________ or __________________________.

Positively charged ions have more protons than electrons.

•The rate of flow of electric charges is called ______________________

In ____________________________, charges repeatedly shift from flowing in one direction to flowing in the reverse direction.

Voltage is expressed in units of __________________.

All atoms have a dense center called a nucleus.