Electrical forces can do work and there is a potential energy associated with this force. We often use the ideal of electric potential and it is associated with the idea of electric potential energy. Conductors and Insulators Materials are classified by how freely charge and move in or on the material. Materials that allow charge to move easily are called electrical conductors, or conductors for short. Materials that strongly resist the movement of charge are called electrical insulators, or just insulators.
Metals are good conductors, both of electric charge and heat.
Materials like glass and wood are electrical insulators and thermal insulators.